Translatewiki.net does not have a mobile view (MobileFrontend and MinervaNeue)
MobileFrontend is a rather expensive extension to maintain, so I don't think the translatewiki.net staff has enough resources to provide this option. However, work is ongoing to switch to the Timeless skin, which is more responsive and should address most concerns: Thread:Support/Proposal to change default skin to Timeless. I suggest that you enable the Timeless skin in your preferences and report any issues you find.
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.