Update version from 2.0 to 2.1 and fix Bengali.

git-svn-id: https://plugins.svn.wordpress.org/ajax-archive-calendar/trunk@899360 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update

git-svn-id: https://plugins.svn.wordpress.org/ajax-archive-calendar/trunk@899366 b8457f37-d9ea-0310-8a92-e5e31aec5664