i18n: Sync translations from Transifex

Thanks as always to our kind volunteer translators.

Author: gnprice

static/translations/messages_bg.json

@@ -355,6 +355,6 @@
   "Owner": "Owner",
   "Admin": "Admin",
   "Moderator": "Moderator",
-  "Member": "Member",
+  "Member": "Потребител",
   "Guest": "Гост"
 }

static/translations/messages_ca.json

@@ -355,6 +355,6 @@
   "Owner": "Propietari",
   "Admin": "Admin",
   "Moderator": "Moderator",
-  "Member": "Member",
+  "Member": "Membre",
   "Guest": "Convidat"
 }