Bug 1072458 - Certain characters cannot be input using Bangla keyboard

(cherry picked from commit 707c14abb8dc8046c9dcbeef25b59a331635c34f)

Conflicts:
	apps/keyboard/js/layouts/bn-Avro.js
a=bajaj.

(cherry picked from commit 5616d86d52970bae0fdc65eaf7db97360172e750)