Last modified: 2010-05-15 15:33:03 UTC
On international projects like commons, the default main page (direct access or click on the logo) should redirect on the localised main page corresponding to the localisation setting choosed by the user.
This was fixed in 1.4 beta2 (or beta3?), as well as in HEAD, by customizing the array $wgForceUIMsgAsContentMsg. See comments in DefaultSettings.php, around line 940.