fix(pat-tinymce): Ingore english language variant translations.

[thet]

For english translations, ignore country specific language varants. This fixes a probem which occured with a language variant as portal language.

TODO: verify! but I can't remember anymore.

[petschki]

I quickly created a Classic-UI Site with en-us as portal language and TinyMCE worked well... not sure if there are some corner cases though. But this change hardens language negotiation anyways and can be merged in my opinion.

[thet]

Something has changed in TinyMCE lanugage loading.
When loading the language js file a tinymce.addI18n method must already exist.
Maybe we can first initialize TinyMCE with english language and then load the translation file?
Or we use the language_url option?
Anyways, TinyMCE doesn't make it easy to not use their premium plugins.
https://www.tiny.cloud/docs/tinymce/latest/ui-localization/

[petschki]

Oh yes. Free Tiny gets more and more cut in abilities. There is a hint to platejs in the bucharest sprint docs. Definitely worth a look for classic ui too.

[thet]

We can already use https://github.com/patternslib/pat-tiptap
It would be nice to have that integrated in Plone.

[thet]

I tried to load the TinyMCE 8 languages in this PR: #1558

I think this one is obsolete. I cannot reproduce the problem either.

[thet]

I tried to load the TinyMCE 8 languages in this PR: #1558

I think this one is obsolete. I cannot reproduce the problem either.