TinyMCE language is NOT changed, for example for Russian (ru) in - \templates\base\scripts\BxBaseConfig.php
Even change all cases - languages : "ru", - not Russian but just tags will displays!
And (for Boonex) - we need that you update TinyMCE to LAST Version: 3.3.6 - in D 7.0.2 and fix that issue to correct language problem, or give detailed description, how to change TinyMCE language.