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, 3 insertions, 1 deletions

diff --git a/src/lib/User/BadgeWall/AWC.svelte b/src/lib/User/BadgeWall/AWC.svelte
index da01e484..5684eb2f 100644
--- a/src/lib/User/BadgeWall/AWC.svelte
+++ b/src/lib/User/BadgeWall/AWC.svelte
@@ -4,6 +4,7 @@ import type { AWCBadgesGroup } from "$lib/Data/awc";
 import { cdn, thumbnail } from "$lib/Utility/image";
 import type { Preferences } from "../../../graphql/$types";
 import FallbackBadge from "./FallbackBadge.svelte";
+import locale from "$stores/locale";
 import "./badges.css";
 
 export let awcPromise: Promise<Response>;
@@ -79,7 +80,8 @@ const awcBadgesGrouped = (awcResponse: string): AWCBadgesGroup[] => {
         {#each parsedBadges as group}
           <details open={categoryFilter || isOwner ? false : true}>
             <summary>
-              Anime Watching Club <span class="opaque">|</span>
+              {$locale().badgeWall?.awcGroup}
+              <span class="opaque">|</span>
               {group.group}
             </summary>