Update `Bengali` translation

Currently translated at 5.6% (7 of 123 strings)

Translation: Wiki-Bot/Dashboard
Translate-URL: https://weblate.frisk.space/projects/wiki-bot/dashboard/bn/

dashboard/i18n/bn.json

@@ -1,9 +1,9 @@
 {
     "fallback": [
+        "en",
         " ",
         " ",
         " ",
-        "en",
         " "
     ],
     "general": {