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

57% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'bg'.

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

frontend/src/i18n/bg.json

@@ -155,7 +155,7 @@
     "search": "Търсене ...",
     "typeToSearch": "Пишете за търсене ...",
     "types": "Типове",
-    "video": "Video"
+    "video": "Видео"
   },
   "settings": {
     "aceEditorTheme": "Ace editor theme",