Add confirmation for Leave Group buttons in bp-legacy templates.

Fixes #5061

Props dcavins

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7458 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Fix alphabeticization and whitespace in BP_Legacy::enqueue_scripts()

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7459 cdf35c40-ae34-48e0-9cc9-0c9da1808c22