Locale generalization so JS_LOCALE of de_DE results in use of de #1176
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Recreation of #1168
The languages supported by TinyMCE editor are maintained as two-letter country codes while the JS_LOCALE will typically be the combination of country and language code, i.e. de_DE. The current locale matching in the TinyMCE editor does not detect / select an available, generalized locale and essentially always falls back to English.
This PR adds locale generalization checks during in the locale match code of the TinyMCE editor.