When it comes to forum Should I use X-Forum 4.11 or Newbb 4.0 RC ? What is the differents? what is your meaning?

Xlanguage will it work with the content module? You have other suggestions for content management when I want to have two languages?

Version 4.01 is in development and only to be used for testing.
Best forum is still Newbb/CBB 3.08.

Xlanguage will work with any module. You have the possibility of inserting the language tags ([en][/en], etc ) anywhere, also in titles etc. Some fields are rather small and may give problems when the tiles are long and there are many languages.
Some modules may also provide in short extracts of articles. When this is done automatic on eg a fixed length, then this can lead to display problems, due to unbalanced tags from the cutoff.