add option to put Translate button in the note toolbar

13 files changed, 128 insertions, 42 deletions

diff --git a/locales/index.d.ts b/locales/index.d.ts
index 3316a679e0..e10511db05 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -12933,6 +12933,14 @@ export interface Locale extends ILocale {
      * Fetch linked note
      */
     "fetchLinkedNote": string;
+    /**
+     * Add "Translate" to note action menu
+     */
+    "showTranslationButtonInNoteFooter": string;
+    /**
+     * Failed to translate note. Please try again later or contact an administrator for assistance.
+     */
+    "translationFailed": string;
     "_processErrors": {
         /**
          * Unable to process quote. This post may be missing context.
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index b4977b73bc..f4c33f6ea8 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -86,12 +86,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 							:isBlock="true"
 							class="_selectable"
 						/>
-						<div v-if="translating || translation" :class="$style.translation">
+						<div v-if="translating || translation != null" :class="$style.translation">
 							<MkLoading v-if="translating" mini/>
-							<div v-else-if="translation">
+							<div v-else-if="translation && translation.text != null">
 								<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 								<Mfm :text="translation.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis" class="_selectable"/>
 							</div>
+							<div v-else>{{ i18n.ts.translationFailed }}</div>
 						</div>
 						<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 						<MkButton v-else-if="!prefer.s.animatedMfm && allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
@@ -163,6 +164,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<button v-if="prefer.s.showClipButtonInNoteFooter" ref="clipButton" :class="$style.footerButton" class="_button" @mousedown.prevent="clip()">
 					<i class="ti ti-paperclip"></i>
 				</button>
+				<button v-if="prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable" ref="translationButton" class="_button" :class="$style.footerButton" @mousedown.prevent="translate()">
+					<i class="ti ti-language-hiragana"></i>
+				</button>
 				<button ref="menuButton" :class="$style.footerButton" class="_button" @mousedown.prevent="showMenu()">
 					<i class="ti ti-dots"></i>
 				</button>
@@ -219,7 +223,7 @@ import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
 import { checkAnimationFromMfm } from '@/utility/check-animated-mfm.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
-import { getAbuseNoteMenu, getCopyNoteLinkMenu, getNoteClipMenu, getNoteMenu, getRenoteMenu } from '@/utility/get-note-menu.js';
+import { getAbuseNoteMenu, getCopyNoteLinkMenu, getNoteClipMenu, getNoteMenu, getRenoteMenu, translateNote } from '@/utility/get-note-menu.js';
 import { getNoteVersionsMenu } from '@/utility/get-note-versions-menu.js';
 import { useNoteCapture } from '@/use/use-note-capture.js';
 import { deepClone } from '@/utility/clone.js';
@@ -229,7 +233,7 @@ import { getNoteSummary } from '@/utility/get-note-summary.js';
 import MkRippleEffect from '@/components/MkRippleEffect.vue';
 import { showMovedDialog } from '@/utility/show-moved-dialog.js';
 import { boostMenuItems, computeRenoteTooltip } from '@/utility/boost-quote.js';
-import { isEnabledUrlPreview } from '@/instance.js';
+import { instance, isEnabledUrlPreview } from '@/instance.js';
 import { focusPrev, focusNext } from '@/utility/focus.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { prefer } from '@/preferences.js';
@@ -310,7 +314,7 @@ const collapsed = ref(prefer.s.expandLongNote && appearNote.value.cw == null &&
 const isDeleted = ref(false);
 const renoted = ref(false);
 const { muted, hardMuted } = checkMutes(appearNote.value, props.withHardMute);
-const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const showTicker = (prefer.s.instanceTicker === 'always') || (prefer.s.instanceTicker === 'remote' && appearNote.value.user.instance);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
@@ -358,6 +362,11 @@ const keymap = {
 		if (!prefer.s.showClipButtonInNoteFooter) return;
 		clip();
 	},
+	't': () => {
+		if (prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable) {
+			translate();
+		}
+	},
 	'o': () => {
 		if (renoteCollapsed.value) return;
 		galleryEl.value?.openGallery();
@@ -780,6 +789,12 @@ async function clip(): Promise<void> {
 	os.popupMenu(await getNoteClipMenu({ note: note.value, isDeleted, currentClip: currentClip?.value }), clipButton.value).then(focus);
 }
 
+async function translate() {
+	if (props.mock) return;
+
+	await translateNote(appearNote.value.id, translation, translating);
+}
+
 function showRenoteMenu(): void {
 	if (props.mock) {
 		return;
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index 4a51cb3641..dcdbfaf53f 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -104,12 +104,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 					class="_selectable"
 				/>
 				<a v-if="appearNote.renote != null" :class="$style.rn">RN:</a>
-				<div v-if="translating || translation" :class="$style.translation">
+				<div v-if="translating || translation != null" :class="$style.translation">
 					<MkLoading v-if="translating" mini/>
-					<div v-else-if="translation">
+					<div v-else-if="translation && translation.text != null">
 						<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 						<Mfm :text="translation.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis" class="_selectable"/>
 					</div>
+					<div v-else>{{ i18n.ts.translationFailed }}</div>
 				</div>
 				<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 				<MkButton v-else-if="!prefer.s.animatedMfm && allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
@@ -175,6 +176,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<button v-if="prefer.s.showClipButtonInNoteFooter" ref="clipButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="clip()">
 				<i class="ti ti-paperclip"></i>
 			</button>
+			<button v-if="prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable" ref="translationButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="translate()">
+				<i class="ti ti-language-hiragana"></i>
+			</button>
 			<button ref="menuButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="showMenu()">
 				<i class="ti ti-dots"></i>
 			</button>
@@ -267,7 +271,7 @@ import { reactionPicker } from '@/utility/reaction-picker.js';
 import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
-import { getNoteClipMenu, getNoteMenu, getRenoteMenu } from '@/utility/get-note-menu.js';
+import { getNoteClipMenu, getNoteMenu, getRenoteMenu, translateNote } from '@/utility/get-note-menu.js';
 import { getNoteVersionsMenu } from '@/utility/get-note-versions-menu.js';
 import { checkAnimationFromMfm } from '@/utility/check-animated-mfm.js';
 import { useNoteCapture } from '@/use/use-note-capture.js';
@@ -281,7 +285,7 @@ import MkPagination from '@/components/MkPagination.vue';
 import MkReactionIcon from '@/components/MkReactionIcon.vue';
 import MkButton from '@/components/MkButton.vue';
 import { boostMenuItems, computeRenoteTooltip } from '@/utility/boost-quote.js';
-import { isEnabledUrlPreview } from '@/instance.js';
+import { instance, isEnabledUrlPreview } from '@/instance.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { prefer } from '@/preferences.js';
 import { getPluginHandlers } from '@/plugin.js';
@@ -337,7 +341,7 @@ const isMyRenote = $i && ($i.id === note.value.userId);
 const showContent = ref(prefer.s.uncollapseCW);
 const isDeleted = ref(false);
 const renoted = ref(false);
-const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const parsed = appearNote.value.text ? mfm.parse(appearNote.value.text) : null;
 const urls = parsed ? extractUrlFromMfm(parsed).filter((url) => appearNote.value.renote?.url !== url && appearNote.value.renote?.uri !== url) : null;
@@ -386,6 +390,11 @@ const keymap = {
 		if (!prefer.s.showClipButtonInNoteFooter) return;
 		clip();
 	},
+	't': () => {
+		if (prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable) {
+			translate();
+		}
+	},
 	'o': () => galleryEl.value?.openGallery(),
 	'v|enter': () => {
 		if (appearNote.value.cw != null) {
@@ -764,6 +773,10 @@ async function clip(): Promise<void> {
 	os.popupMenu(await getNoteClipMenu({ note: note.value, isDeleted }), clipButton.value).then(focus);
 }
 
+async function translate() {
+	await translateNote(appearNote.value.id, translation, translating);
+}
+
 function showRenoteMenu(): void {
 	if (!isMyRenote) return;
 	pleaseLogin({ openOnRemote: pleaseLoginContext.value });
diff --git a/packages/frontend/src/components/MkNoteSub.vue b/packages/frontend/src/components/MkNoteSub.vue
index 7661bebfe7..eb72939bf1 100644
--- a/packages/frontend/src/components/MkNoteSub.vue
+++ b/packages/frontend/src/components/MkNoteSub.vue
@@ -123,7 +123,7 @@ const props = withDefaults(defineProps<{
 const canRenote = computed(() => ['public', 'home'].includes(props.note.visibility) || props.note.userId === $i?.id);
 
 const el = shallowRef<HTMLElement>();
-const translation = ref<any>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const isDeleted = ref(false);
 const renoted = ref(false);
diff --git a/packages/frontend/src/components/MkSubNoteContent.vue b/packages/frontend/src/components/MkSubNoteContent.vue
index 8ac07c012a..e2a8ee4fe6 100644
--- a/packages/frontend/src/components/MkSubNoteContent.vue
+++ b/packages/frontend/src/components/MkSubNoteContent.vue
@@ -12,12 +12,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<Mfm v-if="note.text" :text="note.text" :isBlock="true" :author="note.user" :nyaize="'respect'" :isAnim="allowAnim" :emojiUrls="note.emojis"/>
 		<MkButton v-if="!allowAnim && animated && !hideFiles" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 		<MkButton v-else-if="!prefer.s.animatedMfm && allowAnim && animated && !hideFiles" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
-		<div v-if="note.text && translating || note.text && translation" :class="$style.translation">
+		<div v-if="note.text && translating || note.text && translation != null" :class="$style.translation">
 			<MkLoading v-if="translating" mini/>
-			<div v-else>
+			<div v-else-if="translation && translation.text != null">
 				<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 				<Mfm :text="translation.text" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 			</div>
+			<div v-else>{{ i18n.ts.translationFailed }}</div>
 		</div>
 		<MkA v-if="note.renoteId" :class="$style.rp" :to="`/notes/${note.renoteId}`" @click.stop>RN: ...</MkA>
 	</div>
@@ -55,7 +56,7 @@ import { prefer } from '@/preferences.js';
 const props = defineProps<{
 	note: Misskey.entities.Note;
 	translating?: boolean;
-	translation?: any;
+	translation?: Misskey.entities.NotesTranslateResponse | false | null;
 	hideFiles?: boolean;
 	expandAllCws?: boolean;
 }>();
diff --git a/packages/frontend/src/components/SkNote.vue b/packages/frontend/src/components/SkNote.vue
index ab8a3ec4a6..4f8b3a0900 100644
--- a/packages/frontend/src/components/SkNote.vue
+++ b/packages/frontend/src/components/SkNote.vue
@@ -88,12 +88,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 							:isAnim="allowAnim"
 							:isBlock="true"
 						/>
-						<div v-if="translating || translation" :class="$style.translation">
+						<div v-if="translating || translation != null" :class="$style.translation">
 							<MkLoading v-if="translating" mini/>
-							<div v-else-if="translation">
+							<div v-else-if="translation && translation.text != null">
 								<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 								<Mfm :text="translation.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis" class="_selectable"/>
 							</div>
+							<div v-else>{{ i18n.ts.translationFailed }}</div>
 						</div>
 						<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 						<MkButton v-else-if="!prefer.s.animatedMfm && allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
@@ -164,6 +165,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<button v-if="prefer.s.showClipButtonInNoteFooter" ref="clipButton" :class="$style.footerButton" class="_button" @mousedown.prevent="clip()">
 					<i class="ti ti-paperclip"></i>
 				</button>
+				<button v-if="prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable" ref="translationButton" class="_button" :class="$style.footerButton" @mousedown.prevent="translate()">
+					<i class="ti ti-language-hiragana"></i>
+				</button>
 				<button ref="menuButton" :class="$style.footerButton" class="_button" @mousedown.prevent="showMenu()">
 					<i class="ti ti-dots"></i>
 				</button>
@@ -219,7 +223,7 @@ import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
 import { checkAnimationFromMfm } from '@/utility/check-animated-mfm.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
-import { getAbuseNoteMenu, getCopyNoteLinkMenu, getNoteClipMenu, getNoteMenu } from '@/utility/get-note-menu.js';
+import { getAbuseNoteMenu, getCopyNoteLinkMenu, getNoteClipMenu, getNoteMenu, translateNote } from '@/utility/get-note-menu.js';
 import { getNoteVersionsMenu } from '@/utility/get-note-versions-menu.js';
 import { useNoteCapture } from '@/use/use-note-capture.js';
 import { deepClone } from '@/utility/clone.js';
@@ -229,7 +233,7 @@ import { getNoteSummary } from '@/utility/get-note-summary.js';
 import MkRippleEffect from '@/components/MkRippleEffect.vue';
 import { showMovedDialog } from '@/utility/show-moved-dialog.js';
 import { boostMenuItems, computeRenoteTooltip } from '@/utility/boost-quote.js';
-import { isEnabledUrlPreview } from '@/instance.js';
+import { instance, isEnabledUrlPreview } from '@/instance.js';
 import { focusPrev, focusNext } from '@/utility/focus.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { prefer } from '@/preferences.js';
@@ -310,7 +314,7 @@ const collapsed = ref(prefer.s.expandLongNote && appearNote.value.cw == null &&
 const isDeleted = ref(false);
 const renoted = ref(false);
 const { muted, hardMuted } = checkMutes(appearNote.value, props.withHardMute);
-const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const showTicker = (prefer.s.instanceTicker === 'always') || (prefer.s.instanceTicker === 'remote' && appearNote.value.user.instance);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
@@ -358,6 +362,11 @@ const keymap = {
 		if (!prefer.s.showClipButtonInNoteFooter) return;
 		clip();
 	},
+	't': () => {
+		if (prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable) {
+			translate();
+		}
+	},
 	'o': () => {
 		if (renoteCollapsed.value) return;
 		galleryEl.value?.openGallery();
@@ -780,6 +789,12 @@ async function clip(): Promise<void> {
 	os.popupMenu(await getNoteClipMenu({ note: note.value, isDeleted, currentClip: currentClip?.value }), clipButton.value).then(focus);
 }
 
+async function translate() {
+	if (props.mock) return;
+
+	await translateNote(appearNote.value.id, translation, translating);
+}
+
 function showRenoteMenu(): void {
 	if (props.mock) {
 		return;
diff --git a/packages/frontend/src/components/SkNoteDetailed.vue b/packages/frontend/src/components/SkNoteDetailed.vue
index c499855a80..e2a9ba9a40 100644
--- a/packages/frontend/src/components/SkNoteDetailed.vue
+++ b/packages/frontend/src/components/SkNoteDetailed.vue
@@ -109,12 +109,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 					class="_selectable"
 				/>
 				<a v-if="appearNote.renote != null" :class="$style.rn">RN:</a>
-				<div v-if="translating || translation" :class="$style.translation">
+				<div v-if="translating || translation != null" :class="$style.translation">
 					<MkLoading v-if="translating" mini/>
-					<div v-else-if="translation">
+					<div v-else-if="translation && translation.text != null">
 						<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 						<Mfm :text="translation.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis" class="_selectable"/>
 					</div>
+					<div v-else>{{ i18n.ts.translationFailed }}</div>
 				</div>
 				<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 				<MkButton v-else-if="!prefer.s.animatedMfm && allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
@@ -180,6 +181,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<button v-if="prefer.s.showClipButtonInNoteFooter" ref="clipButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="clip()">
 				<i class="ti ti-paperclip"></i>
 			</button>
+			<button v-if="prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable" ref="translationButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="translate()">
+				<i class="ti ti-language-hiragana"></i>
+			</button>
 			<button ref="menuButton" class="_button" :class="$style.noteFooterButton" @mousedown.prevent="showMenu()">
 				<i class="ti ti-dots"></i>
 			</button>
@@ -272,7 +276,7 @@ import { reactionPicker } from '@/utility/reaction-picker.js';
 import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
 import { $i } from '@/i.js';
 import { i18n } from '@/i18n.js';
-import { getNoteClipMenu, getNoteMenu, getRenoteMenu } from '@/utility/get-note-menu.js';
+import { getNoteClipMenu, getNoteMenu, getRenoteMenu, translateNote } from '@/utility/get-note-menu.js';
 import { getNoteVersionsMenu } from '@/utility/get-note-versions-menu.js';
 import { checkAnimationFromMfm } from '@/utility/check-animated-mfm.js';
 import { useNoteCapture } from '@/use/use-note-capture.js';
@@ -286,7 +290,7 @@ import MkPagination from '@/components/MkPagination.vue';
 import MkReactionIcon from '@/components/MkReactionIcon.vue';
 import MkButton from '@/components/MkButton.vue';
 import { boostMenuItems, computeRenoteTooltip } from '@/utility/boost-quote.js';
-import { isEnabledUrlPreview } from '@/instance.js';
+import { instance, isEnabledUrlPreview } from '@/instance.js';
 import { getAppearNote } from '@/utility/get-appear-note.js';
 import { prefer } from '@/preferences.js';
 import { getPluginHandlers } from '@/plugin.js';
@@ -343,7 +347,7 @@ const isMyRenote = $i && ($i.id === note.value.userId);
 const showContent = ref(prefer.s.uncollapseCW);
 const isDeleted = ref(false);
 const renoted = ref(false);
-const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const parsed = appearNote.value.text ? mfm.parse(appearNote.value.text) : null;
 const urls = parsed ? extractUrlFromMfm(parsed).filter((url) => appearNote.value.renote?.url !== url && appearNote.value.renote?.uri !== url) : null;
@@ -392,6 +396,11 @@ const keymap = {
 		if (!prefer.s.showClipButtonInNoteFooter) return;
 		clip();
 	},
+	't': () => {
+		if (prefer.s.showTranslationButtonInNoteFooter && $i?.policies.canUseTranslator && instance.translatorAvailable) {
+			translate();
+		}
+	},
 	'o': () => galleryEl.value?.openGallery(),
 	'v|enter': () => {
 		if (appearNote.value.cw != null) {
@@ -770,6 +779,10 @@ async function clip(): Promise<void> {
 	os.popupMenu(await getNoteClipMenu({ note: note.value, isDeleted }), clipButton.value).then(focus);
 }
 
+async function translate() {
+	await translateNote(appearNote.value.id, translation, translating);
+}
+
 function showRenoteMenu(): void {
 	if (!isMyRenote) return;
 	pleaseLogin({ openOnRemote: pleaseLoginContext.value });
diff --git a/packages/frontend/src/components/SkNoteSub.vue b/packages/frontend/src/components/SkNoteSub.vue
index 4c4fca2450..434af87ed9 100644
--- a/packages/frontend/src/components/SkNoteSub.vue
+++ b/packages/frontend/src/components/SkNoteSub.vue
@@ -137,7 +137,7 @@ const canRenote = computed(() => ['public', 'home'].includes(props.note.visibili
 const hideLine = computed(() => props.detail);
 
 const el = shallowRef<HTMLElement>();
-const translation = ref<any>(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const isDeleted = ref(false);
 const renoted = ref(false);
diff --git a/packages/frontend/src/components/SkOldNoteWindow.vue b/packages/frontend/src/components/SkOldNoteWindow.vue
index bd5368351b..01339dbab8 100644
--- a/packages/frontend/src/components/SkOldNoteWindow.vue
+++ b/packages/frontend/src/components/SkOldNoteWindow.vue
@@ -42,12 +42,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkA v-if="appearNote.replyId" :class="$style.noteReplyTarget" :to="`/notes/${appearNote.replyId}`"><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
 					<Mfm v-if="appearNote.text" :text="appearNote.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 					<a v-if="appearNote.renote != null" :class="$style.rn">RN:</a>
-					<div v-if="translating || translation" :class="$style.translation">
+					<div v-if="translating || translation != null" :class="$style.translation">
 						<MkLoading v-if="translating" mini/>
-						<div v-else>
-							<b>{{ i18n.t('translatedFrom', { x: translation.sourceLang }) }}: </b>
+						<div v-else-if="translation && translation.text != null">
+							<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
 							<Mfm :text="translation.text" :isBlock="true" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 						</div>
+						<div v-else>{{ i18n.ts.translationFailed }}</div>
 					</div>
 					<div v-if="appearNote.files && appearNote.files.length > 0">
 						<MkMediaList :mediaList="appearNote.files"/>
@@ -151,7 +152,7 @@ const renoteUrl = appearNote.value.renote ? appearNote.value.renote.url : null;
 const renoteUri = appearNote.value.renote ? appearNote.value.renote.uri : null;
 
 const showContent = ref(false);
-const translation = ref(null);
+const translation = ref<Misskey.entities.NotesTranslateResponse | false | null>(null);
 const translating = ref(false);
 const urls = appearNote.value.text ? extractUrlFromMfm(mfm.parse(appearNote.value.text)).filter(u => u !== renoteUrl && u !== renoteUri) : null;
 const showTicker = (prefer.s.instanceTicker === 'always') || (prefer.s.instanceTicker === 'remote' && appearNote.value.user.instance);
diff --git a/packages/frontend/src/pages/settings/preferences.vue b/packages/frontend/src/pages/settings/preferences.vue
index ff366d699f..a537b6e837 100644
--- a/packages/frontend/src/pages/settings/preferences.vue
+++ b/packages/frontend/src/pages/settings/preferences.vue
@@ -271,6 +271,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 									</MkPreferenceContainer>
 								</SearchMarker>
 
+								<SearchMarker :keywords="['footer', 'action', 'translation', 'show']">
+									<MkPreferenceContainer k="showTranslationButtonInNoteFooter">
+										<MkSwitch v-model="showTranslationButtonInNoteFooter">
+											<template #label><SearchLabel>{{ i18n.ts.showTranslationButtonInNoteFooter }}</SearchLabel></template>
+										</MkSwitch>
+									</MkPreferenceContainer>
+								</SearchMarker>
+
 								<SearchMarker :keywords="['reaction', 'count', 'show']">
 									<MkPreferenceContainer k="showReactionsCount">
 										<MkSwitch v-model="showReactionsCount">
@@ -964,6 +972,7 @@ const serverDisconnectedBehavior = prefer.model('serverDisconnectedBehavior');
 const hemisphere = prefer.model('hemisphere');
 const showNoteActionsOnlyHover = prefer.model('showNoteActionsOnlyHover');
 const showClipButtonInNoteFooter = prefer.model('showClipButtonInNoteFooter');
+const showTranslationButtonInNoteFooter = prefer.model('showTranslationButtonInNoteFooter');
 const collapseRenotes = prefer.model('collapseRenotes');
 const advancedMfm = prefer.model('advancedMfm');
 const showReactionsCount = prefer.model('showReactionsCount');
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index 277508d79d..a4d52c8acb 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -248,6 +248,9 @@ export const PREF_DEF = {
 	showClipButtonInNoteFooter: {
 		default: false,
 	},
+	showTranslationButtonInNoteFooter: {
+		default: false,
+	},
 	reactionsDisplaySize: {
 		default: 'medium' as 'small' | 'medium' | 'large',
 	},
diff --git a/packages/frontend/src/utility/get-note-menu.ts b/packages/frontend/src/utility/get-note-menu.ts
index 0326ebdac8..f773149fac 100644
--- a/packages/frontend/src/utility/get-note-menu.ts
+++ b/packages/frontend/src/utility/get-note-menu.ts
@@ -176,7 +176,7 @@ function getNoteEmbedCodeMenu(note: Misskey.entities.Note, text: string): MenuIt
 
 export function getNoteMenu(props: {
 	note: Misskey.entities.Note;
-	translation: Ref<Misskey.entities.NotesTranslateResponse | null>;
+	translation: Ref<Misskey.entities.NotesTranslateResponse | false | null>;
 	translating: Ref<boolean>;
 	isDeleted: Ref<boolean>;
 	currentClip?: Misskey.entities.Clip;
@@ -290,17 +290,6 @@ export function getNoteMenu(props: {
 		os.pageWindow(`/notes/${appearNote.id}`);
 	}
 
-	async function translate(): Promise<void> {
-		if (props.translation.value != null) return;
-		props.translating.value = true;
-		props.translation.value = await misskeyApi('notes/translate', {
-			noteId: appearNote.id,
-			targetLang: miLocalStorage.getItem('lang') ?? navigator.language,
-		}).finally(() => {
-			props.translating.value = false;
-		});
-	}
-
 	const menuItems: MenuItem[] = [];
 
 	if ($i) {
@@ -357,7 +346,7 @@ export function getNoteMenu(props: {
 			menuItems.push({
 				icon: 'ti ti-language-hiragana',
 				text: i18n.ts.translate,
-				action: translate,
+				action: () => translateNote(appearNote.id, props.translation, props.translating),
 			});
 		}
 
@@ -697,3 +686,20 @@ export function getRenoteMenu(props: {
 		menu: renoteItems,
 	};
 }
+
+export async function translateNote(noteId: string, translation: Ref<Misskey.entities.NotesTranslateResponse | false | null>, translating: Ref<boolean>): Promise<void> {
+	if (translating.value || translation.value) return;
+	translating.value = true;
+	try {
+		const targetLang = miLocalStorage.getItem('lang') ?? navigator.language;
+		translation.value = await misskeyApi('notes/translate', {
+			noteId,
+			targetLang,
+		});
+	} catch (err) {
+		console.error(`Translation failed for ${noteId}: `, err);
+		translation.value = false;
+	} finally {
+		translating.value = false;
+	}
+}
diff --git a/sharkey-locales/en-US.yml b/sharkey-locales/en-US.yml
index bf746533af..d2e28b9ddd 100644
--- a/sharkey-locales/en-US.yml
+++ b/sharkey-locales/en-US.yml
@@ -523,6 +523,8 @@ id: "ID"
 mandatoryCW: "Force content warning"
 mandatoryCWDescription: "Applies a content warning to all posts created by this user. If the post already has a CW, then this is appended to the end."
 fetchLinkedNote: "Fetch linked note"
+showTranslationButtonInNoteFooter: "Add \"Translate\" to note action menu"
+translationFailed: "Failed to translate note. Please try again later or contact an administrator for assistance."
 
 _processErrors:
   quoteUnavailable: "Unable to process quote. This post may be missing context."