Add Finnish (fi) translation (#299)

* Add Finnish (fi) locale file for nodewarden web vault translation

webapp/src/lib/i18n.ts

@@ -10,10 +10,10 @@ export type Locale =
   | 'zh-CN'
   | 'zh-TW'
   | 'ru'
-  | 'es';
+  | 'es'
+  | 'fi';
 
 import enMessages from './i18n/locales/en';
-
 const LOCALE_STORAGE_KEY = 'nodewarden.locale';
 
 type MessageTable = Record<string, string>;
@@ -24,6 +24,7 @@ export const AVAILABLE_LOCALES: readonly { value: Locale; label: string }[] = [
   { value: 'zh-TW', label: '繁體中文' },
   { value: 'ru', label: 'Русский' },
   { value: 'es', label: 'Español' },
+  { value: 'fi', label: 'Suomi' },
 ];
 
 let locale: Locale = resolveInitialLocale();
@@ -49,6 +50,7 @@ function resolveInitialLocale(): Locale {
       if (normalized.startsWith('zh')) return 'zh-CN';
       if (normalized.startsWith('ru')) return 'ru';
       if (normalized.startsWith('es')) return 'es';
+      if (normalized.startsWith('fi')) return 'fi';
     }
   }
   return 'en';
@@ -60,6 +62,7 @@ const localeLoaders: Record<Locale, () => Promise<{ default: MessageTable }>> =
   'zh-TW': () => import('./i18n/locales/zh-TW'),
   ru: () => import('./i18n/locales/ru'),
   es: () => import('./i18n/locales/es'),
+  fi: () => import('./i18n/locales/fi'),
 };
 
 function localeToHtmlLang(value: Locale): string {
@@ -74,7 +77,6 @@ function syncDocumentLanguage(): void {
 async function loadLocaleMessages(next: Locale): Promise<MessageTable> {
   const cached = loadedMessages.get(next);
   if (cached) return cached;
-
   const mod = await localeLoaders[next]();
   loadedMessages.set(next, mod.default);
   return mod.default;
@@ -223,7 +225,6 @@ export function translateServerError(message: string | null | undefined, fallbac
     'masterPasswordHash is required': 'txt_server_error_master_password_hash_required',
     'masterPasswordHash or userVerificationToken is required': 'txt_server_error_master_password_or_verification_required',
   }[normalized];
-
   return key ? t(key) : normalized;
 }