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

56% 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

@@ -152,9 +152,9 @@
     "music": "Музика",
     "pdf": "PDF",
     "pressToSearch": "За търсене, натиснете Enter ...",
-    "search": "Search...",
-    "typeToSearch": "Type to search...",
-    "types": "Types",
+    "search": "Търсене ...",
+    "typeToSearch": "Пишете за търсене ...",
+    "types": "Типове",
     "video": "Video"
   },
   "settings": {