Update `Bengali` translation

Currently translated at 1.6% (2 of 122 strings)

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

dashboard/i18n/bn.json

@@ -1 +1,6 @@
-{}
+{
+    "general": {
+        "settings": "সেটিংস",
+        "title": "উইকি-বট সেটিংস"
+    }
+}