TinyMCE missing translations

[yleclanche]

There are missing translations in TinyMCE, in French but probably in other languages too.

The Increase indent show en.Increase Indent on the demo page : http://plone.github.io/mockup/dev/#pattern/tinymce
And show fr_FR.Increase indent in french.

Table buttons have the same issue (in english too).

Those translations are presents in the js file so it's not just a missing line in a file.

Insert link and insert image popups have lots of missing translations too.

[petschki]

See #849