added filter 'black_studio_tinymce_whitelabel'

I hope you are ok with this. It is just bad when used on sites done for non-devs (Germans are foreign language averse! it is bad :unamused: ) who do not even know why to donate or what rating is good for.

You shouldnt advertise the existence and it will only be used by devs who look at code.

Let me know what you think.