Hello,
I want to help with testing and even more QA.
Welcome Pascal!
Here's some intro:
https://fedoraproject.org/wiki/QA/Join
The instructions are bit unclear. I haven't understood whether you tried to change the
language before/during the installation, or in the installed system. If the latter is the
case, you don't need to mention the installation images and their versions too much,
it's not that important. You simply file a bug against F20.
Also, it's not clear what's not working for you. What's the problem? You
don't say.
Also please note that a language and a keyboard layout are two distinct things and are
configured separately.
Please fill in the missing pieces into bugzilla, thanks.