Use MobileFrontend
Fragment of a discussion from Support/LiquidThreads
Adding mobile target to ext.translate.mainpage.styles and jquery.uls.grid resolved the problem (except that it’s not entirely scalable, i.e. the header is at least 600px wide, but I think that’s acceptable); however, I don’t know if there is some reason to not load the ULS grid style on mobile.
Tacsipacsi (talk)