Added editor dropdown for switching between files

git-svn-id: https://plugins.svn.wordpress.org/loco-translate/trunk@815967 b8457f37-d9ea-0310-8a92-e5e31aec5664
select tweak

git-svn-id: https://plugins.svn.wordpress.org/loco-translate/trunk@815968 b8457f37-d9ea-0310-8a92-e5e31aec5664