Bug 1535288 - Set up productization for Bengali (bn) on Firefox desktop and Firefox for Android r=mkaply

- Use Bengali (bn-BD) as base
- Keep amazon-in on Desktop (from bn-IN)
- Remove rediff (from bn-IN)

Differential Revision: https://phabricator.services.mozilla.com/D23480

--HG--
extra : moz-landing-system : lando

browser/components/search/searchplugins/list.json

@@ -138,6 +138,13 @@
         ]
       }
     },
+    "bn": {
+      "default": {
+        "visibleDefaultEngines": [
+          "google-b-d", "amazon-in", "bing", "ddg", "wikipedia-bn"
+        ]
+      }
+    },
     "bn-BD": {
       "default": {
         "visibleDefaultEngines": [

mobile/android/components/search/searchplugins/list.json

@@ -80,6 +80,13 @@
         ]
       }
     },
+    "bn": {
+      "default": {
+        "visibleDefaultEngines": [
+          "google-b-m", "bing", "ddg", "wikipedia-bn"
+        ]
+      }
+    },
     "bn-BD": {
       "default": {
         "visibleDefaultEngines": [