They don’t have gate information on the TTS platform as it would attract all passengers to look here and would inevitable get more passengers riding the TTS that don’t need to.
If you use your brain then the signage is good especially above TTS it’s clear the direction to each gate area. I flew through the south terminal at Gatwick in January and signage there is not good at all.
Yes the airport does display the gates 1 hour before departing flights. Some flights are displayed before this. Gate 90-93 and Gates 51-59 for example are displayed prior to an hour before departure.
I agree stansted should have some signage in other languages. But not many UK airport do. I know a project to upgrade the PA systems at Stansted is in the works which will allow for any announcements to be translated in any language.