Mistaken statements

Seems like "the language which the user sets within his browser will be used to set the allowed characters ..." is not correct, because there is no Locale::acceptFromHttp() in AbstractLocale.

As well as "Which characters are allowed depends completely on the used language as every language defines it’s own set of characters.", because Zend\I18n\Filter\AbstractLocale use \p{L}.
Merge remote-tracking branch 'origin/pr/1162' into develop

Forward port #1162