Automatic fall back to older browsers added for activity attachments, and avatar upload, eg. MS IE <= 9
Added choose, try_again_msg, and file_types_msg as options for [wps-avatar-change]
Added missing date_format to [wps-forum]

git-svn-id: https://plugins.svn.wordpress.org/wp-symposium-pro/trunk@913516 b8457f37-d9ea-0310-8a92-e5e31aec5664