Hi,
Desktop files are very easy to translate to all languages. All it takes is add a line for "Name" and a line for "Comment", this way:
in the file you have:
Name=My Documents
in a line after you will add:
Name[fr]=Mes Documents
or for german:
Name[de]=Minen Document // sorry if it is wrong, I'm not too keen in German, just know 5 or 6 words.

But you get the picture.
Then for Comment:
Comment=Open File Manager in your Home
becomes:
Comment[fr]=Ouvrez le gestionnaire de fichiers dans votre Home
the same way, add a line for each, for your native language and next it will be a good idea to suggest to add it to a next new package.
Here is the full desktop file for home, to have on /home/user/Desktop directories:
[Desktop Entry]
Type=Application
Icon=gohome
Name=My Documents
Name[fr]=Mes Documents
Comment=Open File Manager in your Home
Comment[fr]=Ouvrez le gestionnaire de fichiers dans votre Home
Comment[et]=Lehitse failisüsteemi ja halda faile
Comment[fi]=Selaa tiedostojärjestelmää ja hallitse tiedostoja
Comment[ja]=ファイルシステムをブラウズし、ファイルの管理を行います
Comment[zh_TW]=瀏覽檔案系統及管理檔案
Categories=FileManager;FileManager;X-MandrivaLinux-System-FileTools;
Exec=pcmanfm %U
StartupNotify=true
Terminal=false
MimeType=x-directory/normal;inode/directory;
Encoding=UTF-8
X-Desktop-File-Install-Version=0.11
Regards,
Mélodie