Translate TinyMCE

Let's translate TinyMCE if language is not English.
This requires that we have to know the TinyMCE theme in the server side,
so we build the TinyMCE options as a PHP array instead of building it as
a JavsScript array.
Centralize configuration of TinyMCE

Currently concrete/blocks/content/editor_config.php and
concrete/elements/editor_config.php share 99% of the code.

Let's centralize this code by adding a new TinymceHelper
Restore the width = 100% for the content block
Add languages for the concrete theme
Fix for extended languages

Some TinyMCE language file has a name with locale code (ex 'zh-cn.js').
Let's support it
Merge branch 'enable-tinymce-languages' of https://github.com/mlocati/concrete5 into mlocati-enable-tinymce-languages