Community Builder (including all add-ons) and CBSubs support different languages using CB Language plugins found below.
A CB Language plugin is installed using the CB Plugin Manager and not the Joomla installer.
Language projects for Community Builder, it's add-ons and CB Paid Subscriptions exist on transifex and we also have dedicated language forums for each active language team:
Joomlapolis transifex area for all our plugins: Join a transifex language team now !
So if you want to help localize our scripts you can participate in an existing language team or if your language team does not exist you can start it and become its manager. If you do not see your specific language in these areas then consider applying for the position.
More resources about language plugins are available in the CB Primer Book and the CBSubs manual.
If you are looking for the latest released language plugin for your language you should visit the Download page. These release are automatically built from the transifex projects based on available translations, so if the translations are incomplete the plugins will be incomplete.
For your convenience here are direct downloads for CB 2.0 Language plugins: