There is a 'language' option for the vBulletin software and quite a few languages have been translated. However, it does NOT interpret post / thread contents. It will only 'translate' button text and other software specific 'phrases'.
There is no problem with people posting in non-English here as far as I am concerned (within the limitations of the software - For example right to left and top to bottom formats are NOT supported). In fact, there was a recent thread which was originally titled something like 'SPANISH POST'.
If someone posts in a language other than English, it might be well to put 'Espanol' or such in the thread title, but also putting in a Spanish thread title which addresses the content.
There are so many different languages around the world (not to mention dialects), I obviously cannot accomodate every language here.
Current commentary welcomed.