i18n: Sync translations from Transifex

Thanks as always to our kind volunteer translators.

Author: chrisbobbe

static/translations/messages_bg.json

@@ -421,7 +421,7 @@
   "What’s your status?": "What’s your status?",
   "Click to join video call": "Click to join video call",
   "Busy": "Busy",
-  "In a meeting": "In a meeting",
+  "In a meeting": "В разговор",
   "Commuting": "Транспорт",
   "Out sick": "Out sick",
   "Vacationing": "Vacationing",