What I propose is to add an error-code/number which is the same regardless of the language used. If this could be something more than just a number, like "[x2go-1234568]" it would be real easy to find information with search engines. This would greatly improve the success rate in resolving any errors, and reduce the potential for frustration. A list, with the potential for translated versions, on the wiki could be kept updated with the error-code and a short helpful explanation/help text.
I really hope this can be considered for X2Go.
From my point of view, I would rather make it easy to run the application in English for debugging and recommend this as the way to go. On Linux, this is easy:
LANG=C x2goclient LANG=C pyhoca-gui
On Windows, pyhoca-gui has a --lang <LANG> option. About x2goclient, I do not have a clue.
Doing error number bookkeeping, I guess I won't become a fan of... Hmmm...
I'm also a "less used" language user and I've had the exact same idea as Terje. Troubleshooting (i e googling) error messages in Swedish is rarely succesful, you pretty much have to translate them to english - with varying success - to get any hits at all. If all error messages included an error code/number it would simplify things a lot. Cheers, Daniel