refactor: cleanup translations

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

core/src/l10n/config.ts

@@ -0,0 +1,2 @@
+/** Locale used before runtime localization configuration is available. */
+export const DEFAULT_LOCALE = 'en';

core/src/l10n/de.json

@@ -1,24 +0,0 @@
-{
-  "header": {
-    "searchPlaceholder": "Hier suchen.."
-  },
-  "systemMenu": {
-    "administration": "Administration",
-    "applications": "Anwendungen",
-    "personalSettings": "Persönliche Einstellungen",
-    "toggleAdmin": "Admin",
-    "toggleApps": "Apps",
-    "toggleSettings": "Einstellungen"
-  },
-  "notifications": {
-    "markAllRead": "Alle als gelesen markieren",
-    "title": "Benachrichtigungen",
-    "viewAll": "Alle anzeigen"
-  },
-  "userMenu": {
-    "darkMode": "Dunkles Design",
-    "lightMode": "Helles Design",
-    "logout": "Abmelden",
-    "settings": "Einstellungen"
-  }
-}

core/src/l10n/en.json

@@ -1,14 +0,0 @@
-{
-  "systemMenu": {
-    "adminSettings": "System",
-    "apps": "Applications",
-    "personalSettings": "Settings",
-    "userSettings": "Settings"
-  },
-  "userMenu": {
-    "darkMode": "Dark Mode",
-    "lightMode": "Light Mode",
-    "logout": "Logout",
-    "settings": "Settings"
-  }
-}

core/src/l10n/runtime.ts

@@ -1,7 +1,6 @@
 import { createI18n } from 'vue-i18n';
 import { en as vuetifyEn, de as vuetifyDe } from 'vuetify/locale';
-
-export const FALLBACK_LOCALE = 'en';
+import { DEFAULT_LOCALE } from '@KTXC/l10n/config';
 
 /**
  * The single vue-i18n instance shared by the core shell and all modules.
@@ -9,8 +8,8 @@ export const FALLBACK_LOCALE = 'en';
 export const i18n = createI18n({
   legacy: false,
   globalInjection: false,
-  locale: FALLBACK_LOCALE,
-  fallbackLocale: FALLBACK_LOCALE,
+  locale: DEFAULT_LOCALE,
+  fallbackLocale: DEFAULT_LOCALE,
   missingWarn: import.meta.env.DEV,
   fallbackWarn: false,
   messages: {
@@ -31,3 +30,8 @@ export function mergeCatalog(locale: string, namespace: string, messages: Record
 export function applyLocale(locale: string): void {
   i18n.global.locale.value = locale;
 }
+
+/** Update the locale used when a translation is missing from the active locale. */
+export function applyFallbackLocale(locale: string): void {
+  i18n.global.fallbackLocale.value = locale;
+}