feat: Translate frontend/src/i18n/en.json in uk

98% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'uk'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

frontend/src/i18n/uk.json

@@ -13,7 +13,7 @@
     "download": "Завантажити",
     "file": "Файл",
     "folder": "Папка",
-    "fullScreen": "Toggle full screen",
+    "fullScreen": "Перемкнути повноекранний режим",
     "hideDotfiles": "Приховати точкові файли",
     "info": "Інфо",
     "more": "Більше",