Implement localization

frontend/src/lib/components/LanguageSwitcher.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+    import { locale, isLoading } from 'svelte-i18n';
+    import { GetLocale, SetLocale } from '$wails/main/App';
+
+    const languages = [
+        { code: 'en', name: 'EN' },
+        { code: 'ru', name: 'RU' }
+    ];
+
+    async function setLanguage(lang: string) {
+        $locale = lang;
+        await SetLocale(lang);
+    }
+</script>
+
+<div class="flex gap-1">
+    {#each languages as lang}
+        <button
+            class="px-3 py-1 rounded-lg transition-colors {$locale === lang.code ? 'bg-blue-500 text-white' : 'bg-gray-800 text-gray-300 hover:bg-gray-700'}"
+            on:click={() => setLanguage(lang.code)}
+            disabled={$isLoading}
+        >
+            {lang.name}
+        </button>
+    {/each}
+</div>