[TYPO3-english] RealURL 2.x: Transliteration?

[Urs Braem]

AFAIK, in RealURL 1.x, special characters were replaced using a dedicated transliteration table. 

Is that still the case for RealURL 2.x? Or does it require certain PHP extensions like http://php.net/manual/de/class.transliterator.php ?

I'm asking because on a server I don't know so well (with TYPO3 7.6), the transliteration is not happening.
("fur" instead of "fuer" for "für").


I've set:

$GLOBALS[TYPO3_CONF_VARS][SYS][systemLocale] = de_CH.UTF-8
config.locale_all = de_CH.UTF-8
in php.ini / user.ini 
intl.default_locale = de_CH.UTF-8 # (?)