[TYPO3-core] FYI: Added feature #4686:Remove dependency of htmlArea RTE Spell Checker on php extension mbstring

[Stanislas Rolland]

Hi Dmitry,
> 
> For the clariry... UTF-8 is double byte. Any cyrillic letter in UTF-8 is 
> double byte. Save for german, latvian and other languages that have 
> non-ascii characters.
> 
Indeed! Sorry for this non-sense. Must have been dreaming...

I committed the attached follow-up patch because I forgot to add the u 
modifier to preg_* operations when the content is encoded with utf-8.

Also, the spell checker button will be removed when the content encoding 
is neither iso-8859-1 nor utf-8, because the script uses PHP xml parser 
which supports only these encodings.

Regards,
Stanislas

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