Missing languages in RTE insert link dialogue

Fixes this issue: http://issues.umbraco.org/issue/U4-2551
Enabled lists plugin in tinymce by default

Fixes http://issues.umbraco.org/issue/U4-3023
Merge branch 'master' of https://github.com/BatJan/Umbraco-CMS into BatJan-master
Merge branch 'BatJan-master' into 6.2.0