Hi
Could you give us some information about your installation?
Telemac version
With Perl or Python scripts
Which type of Machine, OS
As I understand, you try to run telemac on windows. If you use Windows 7, the error message with fudaa is logical, there is a bug in the fudaa launching script. Fudaa can't update de path to allow the computer to find telemac2d.bat. The best solution is to add manually the location of the bin directory to your path.
About the "variable pour la langue" (language variable), it's possible that you had an installation problem and telemac couldn't find the congiguration file. Then the value of LNGTEL is unknown. But this is just an idea
Hope this helps