Hi Dirson,
The language files are in the default_language directory "/components/com_comprofiler/plugin/language/default_language". So all you need to do is to overwrite these files in the language you prefer. Don't forget to make a backup copy of the "default_language" folder so you can allways restore your files if something goes wrong. I'm building a Joomla web with Dutch as the default language. So I just did as mentionded before and overwrote the files in the "default_language" directory with the Dutch translation files profided by "Vancanneyt" et Voila! the Community Builder section is now being presented in Dutch.
That's all it takes.
P.S the Joomla version I use is 1.5.6 (I tried the latest version 1.5.8 but I found out that this version is kind of buggy, doesn't work fine on my web. conflicts and errors with the Seyret video and Fireboard Forum so I draw back to the 1.6.5 version) and the Community Builder is use along is 1.2 RC4. It works great without any problem.
Check your Joomla Version and if it's 1.5.8 then this could be the problem. and perhaps you should consider a draw back to the 1.5.6 version.
Succes!
Peace,
Roy