TinyMCE: add another `Edit` translatable string for the tooltip of the Edit button on the image toolbar. Props pavelevap, see #30694.
Built from https://develop.svn.wordpress.org/trunk@30839


git-svn-id: http://core.svn.wordpress.org/trunk@30829 1a063a9b-81f0-0310-95a4-ce76da25c4cd