Thank you for your reply.
I have disassembled with Reflector.FileDisassembler, and find the string that need to be translated They're dispersed in the whole source code; too much work to translate and maintain translation across versions. Sad news (for me); I _hate_ Object Oriented Language. I, however, preferred that you return to a previous version, with a real language like C. Microsoft tools like visual Studio arent the natural choice for mixing with Open Source tools like SVN (they're more friendly with MS SourceSafe).But SVN repository isn't the only way to place de source code under Open Source Licence, and have guys to helps you improve your work.
I don't know if it is possible with Visual Studio, and how this platform can manage multi lingual resources; but if you can extract and post .rc source file (the forms layout definition, including labels texts), some "enum" objetcs text files and messages files; I can translate and retrun the french result.
However, you've made a very good job !