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on libraries/wall.php on line 615 and 616 which is contains "Cancel" and "Edit Comment" string, please replace line 615 at "Cancel" String with
'.JText::_('COM_COMMUNITY_CANCEL_BUTTON').'
on line 616 at "Edit Comment" string with
'.JText::_('COM_COMMUNITY_EDIT_COMMENT_BUTTON').'
don't forget to add this language string on jomsocial language file on language/en-GB/en-GB.com_community.ini at the very bottom of this file.. you can change this text using override from joomla language :)