I´m sorry if this is the wrong place for it but i saw similar posts here before so:
I chose english on the main site as the only shown language which works just fine, but when i go to the site of a manga (i.e. http://vatoto.com/comic/_/comics/ouroboros-r581 ) there are no chapters and the language bar is also missing (i think you mentioned it was replace by the general setting on the main page).
If the manga has german chapters i can see them though (i am from germany, http://vatoto.com/comic/_/comics/crimezone-r1435 ), but to make it clear: i´ve never chosen german on the manga pages since i can´t stand reading it after getting used to english