refactor(locale): move hardcoded UI strings into english locale

Adds optional namespaces (common, errors, commandPalette, headTitle,
notifications, schedule, events, home, reader, routes, badgePreview,
badgeWall) and extends existing ones (settings.*, lists.*, tools.*,
user.*, hololive.*) on the Locale interface. New fields are optional
so japanese.ts can omit them; svelte-i18n's fallbackLocale handles
the runtime miss.

HeadTitle gains an optional routeKey prop for type-safe lookup.
defaultActions becomes a factory so the command palette re-reads
locale on language toggle. The existing JP feedback translation
in routes/settings is preserved via japanese.ts.

Out of scope (kept hardcoded): service-worker.ts, app.html,
Landing*.svelte, tools.ts registry, Easter Event 2025 pages.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/lib/Media/invalidate.ts b/src/lib/Media/invalidate.ts
index 3a9ff067..2db4b9af 100644
--- a/src/lib/Media/invalidate.ts
+++ b/src/lib/Media/invalidate.ts
@@ -3,6 +3,8 @@ import { addNotification } from "$lib/Notification/store";
 import { options } from "$lib/Notification/options";
 import revalidateAnime from "$stores/revalidateAnime";
 import revalidateManga from "$stores/revalidateManga";
+import locale from "$stores/locale";
+import { get } from "svelte/store";
 
 export const invalidateListCaches = () => {
 	if (!browser) return;
@@ -12,7 +14,9 @@ export const invalidateListCaches = () => {
 
 	addNotification(
 		options({
-			heading: "Anime and manga list caches successfully invalidated",
+			heading:
+				get(locale)().notifications?.cacheInvalidated ??
+				"Anime and manga list caches successfully invalidated",
 		}),
 	);
 };