fix: add missing lang texts, feat: add ukrainian lang, add flags

locales/en/common.json

@@ -612,7 +612,25 @@
     "switch_to_dutch": "Switch to Dutch",
     "switch_to_portuguese": "Switch to Portuguese",
     "switch_to_russian": "Switch to Russian",
-    "switching": "Changing language..."
+    "switching": "Changing language...",
+    "switch": "Switch language",
+    "current": "Current language",
+    "polish": "Polski",
+    "switch_to_polish": "Switch to Polish",
+    "en": "English",
+    "fr": "Français",
+    "de": "Deutsch",
+    "es": "Español",
+    "it": "Italiano",
+    "ja": "日本語",
+    "ko": "한국어",
+    "lv": "Latviešu",
+    "nl": "Nederlands",
+    "pl": "Polski",
+    "pt": "Português",
+    "ru": "Русский",
+    "uk": "Українська",
+    "zh": "简体中文"
   },
   "settings": {
     "title": "Settings",