Translatewiki.net does not have a mobile view (MobileFrontend and MinervaNeue)
Fragment of a discussion from Support/LiquidThreads
I suggest that MobileFrontend and Minervaneue must be enabled to translatewiki.net, is because is more responsive in mobile devices. And also I opened a task in Phabricator at https://phabricator.wikimedia.org/T268340.