CB doesn't handle language switching. That's entirely on Joomla as CB just loads whatever language Joomla says is being used. You'll need a Joomla menu item for each language. So you'd need a menu item to CBs registration page for each language you intend to provide. As for Joomla language switching that's typically done with the language switcher module and the respective language system plugins.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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