Fix missing type support for i18n resources

Due to the change in 65a9a905be - moving to a json file - it wasn't ensured anymore that IsoLanguages contained the i18n language codes

src/i18n/index.ts

@@ -10,7 +10,14 @@ import { i18n } from '@lingui/core';
 import { detectLocale, SELECTED_LANGUAGE_CODE_KEY } from '@/lib/ISOLanguageUtil.ts';
 import { AppStorage } from '@/lib/storage/AppStorage.ts';
 
-// This array is auto-generated by tools/scripts/weblate/generatei18nResources.ts. Do not edit manually.
+/**
+ * Keys have to match {@link IsoLanguages} codes, they're used for showing the language name in the dropdown in the {@link Settings}.<br/>
+ * In case there is no language code for the key in {@link IsoLanguages}, the corresponding language has to be added
+ *
+ * **IMPORTANT:**
+ *
+ * This is generated by the `i18n:gen-resources` script
+ */
 export const i18nResources = [
     'de',
     'en',