i18n: Sync translations from Transifex

Thanks as always to our kind volunteer translators.

static/translations/messages_bg.json

@@ -39,7 +39,7 @@
   "Still working…": "Still working…",
   "Updates may be delayed.": "Updates may be delayed.",
   "No one has read this message yet.": "No one has read this message yet.",
-  "Confirm": "Confirm",
+  "Confirm": "Потвърди",
   "Failed to attach your file.": "Failed to attach your file.",
   "Failed to attach your files.": "Failed to attach your files.",
   "Failed to attach some of your files.": "Failed to attach some of your files.",
@@ -111,7 +111,7 @@
   "Permissions needed": "Permissions needed",
   "Open settings": "Open settings",
   "Camera unavailable.": "Camera unavailable.",
-  "Error": "Error",
+  "Error": "Грешка",
   "The server sent a malformed response.": "The server sent a malformed response.",
   "Storage permission needed": "Storage permission needed",
   "Zulip will save a copy of your photo on your device. To do so, Zulip will need permission to store files on your device.": "Zulip will save a copy of your photo on your device. To do so, Zulip will need permission to store files on your device.",
@@ -135,10 +135,10 @@
   "{_}": "{_}",
   "Home": "Всичко",
   "All messages": "Всички съобщения",
-  "Direct messages": "Direct messages",
+  "Direct messages": "Лични съобщения",
   "Starred": "Отбелязан",
   "Mentions": "Споменавания",
-  "Message": "Message",
+  "Message": "Съобщение",
   "Send": "Изпрати",
   "No recent conversations": "Няма скорошни разговори",
   "No results": "Няма резултати",
@@ -448,7 +448,7 @@
   "Channels": "Channels",
   "Owner": "Owner",
   "Admin": "Admin",
-  "Moderator": "Moderator",
+  "Moderator": "Модератор",
   "Member": "Потребител",
   "Guest": "Гост"
 }