TinyMCE: make the tooltip for the remove button in the image toolbar translatable. Props pavelevap, fixes #30694 for trunk.
Built from https://develop.svn.wordpress.org/trunk@30835


git-svn-id: http://core.svn.wordpress.org/trunk@30825 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen, editor-style: remove margin-bottom from the gallery preview inside the editor. Fixes #30697.
Built from https://develop.svn.wordpress.org/trunk@30836


git-svn-id: http://core.svn.wordpress.org/trunk@30826 1a063a9b-81f0-0310-95a4-ce76da25c4cd