Did you try looking for localization in Yum /Apper / Whatever?  Maybe your system or desktop localization is not complete.  See if it is not a lack of fonts to read and write well in Deutsche.  See at your desktop configuration  (KDE always gives me strange surprises about this).  See in Firefox Settings what languages are preferred.  Usually is English.  The same for Chrome.  See what fonts they use by default, may be is a font problem.
Report a bug.
:-))


Hope this can help you
Lailah