fix: i18ze a string

src/components/tasks/partials/singleTaskInList.vue

@@ -242,7 +242,7 @@ async function markAsDone(checked: boolean) {
 				t('task.doneSuccess') :
 				t('task.undoneSuccess'),
 		}, [{
-			title: 'Undo',
+			title: t('task.undo'),
 			callback: () => undoDone(checked),
 		}])
 	}

src/i18n/lang/en.json

@@ -606,6 +606,7 @@
     "addReminder": "Add a new reminder…",
     "doneSuccess": "The task was successfully marked as done.",
     "undoneSuccess": "The task was successfully un-marked as done.",
+    "undo": "Undo",
     "openDetail": "Open task detail view",
     "checklistTotal": "{checked} of {total} tasks",
     "checklistAllDone": "{total} tasks",

src/views/tasks/TaskDetailView.vue

@@ -731,7 +731,7 @@ async function saveTask(args?: {
 	let actions = []
 	if (undoCallback !== null) {
 		actions = [{
-			title: 'Undo',
+			title: t('task.undo'),
 			callback: undoCallback,
 		}]
 	}