Hey,
I would like to suggest to set:
'wgForceUIMsgAsContentMsg' => array(
'tenwiki' => array( 'mainpage', 'organize-url', 'share-url', 'design-url', 'ideas-url', 'faq-url', ),
),
This configuration (the same as on Wikimedia Commons) will allow to see registered users the Main Page and pages from sidebar in language from preferences.
Any objections?