Thanks for your hint. I'll try it.

Am 12.02.2013 10:55, schrieb Ed Greshko:
On 02/12/2013 05:07 PM, Andreas Assmann wrote:
In Fedora_17_LXDE there was "Start>Administration>Language", but in Fedora_18_LXDE it isn't any more. Why? That's just the problem I posted earlier. Looks like it has simply been forgotten. Don'tunderstand why that simple thing has to be so complicated, whereas it was so easy in Fedora_17_LXDE. Half-done work? Frustrating. In my opinion that iswork for the Fedora-developers. I give up. Nevertheless thanks for your help
As was previously mentioned "system-config-language" appears not to be installed by default.

Once you "yum install system-config-language"  the "Start>Administration>Language"will be there.

If you feel that it should be installed by default when LXDE and Xfce are installed then simply write a bugzilla requesting that.