Improve TinyMCE4 settings

Sébastiaan Versteeg requested to merge fix/tinymce4 into master

Make sure that the TinyMCE4 settings reflect those of TinyMCE 3 and add nl.js for localization. I still needed to check this in !535 (merged) but it is merged now.

Default settings: Screen_Shot_2017-09-10_at_16.28.38

New settings: Screen_Shot_2017-09-10_at_17.53.27

TinyMCE 3: Screen_Shot_2017-09-10_at_17.51.38

Edited by Sébastiaan Versteeg

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