Send back core translation information to the API. Update wp_get_installed_translations() to work with core translations. see #18200.


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git-svn-id: http://core.svn.wordpress.org/trunk@25569 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove inaccurate @return value from remove_role(). props tivnet. fixes #25450.
Built from https://develop.svn.wordpress.org/trunk@25653


git-svn-id: http://core.svn.wordpress.org/trunk@25570 1a063a9b-81f0-0310-95a4-ce76da25c4cd