For players using the non-English versions, this update significantly reduced the number of "missing string" entries (displayed as SXXXXXX errors in the UI).
If you are referring to general features found in the Steam Edition around that time, here are the most helpful ones: OMSI 2 Steam Edition MULTi8 Update 15.03.2018
: The game features a fully functional IBIS (Integrated On-board Information System), realistic physics, and a deep script engine that influences how each bus handles Modding & Community Title: OMSI 2: Omnibus Simulator 2 - Steam
Running an older rig or an offline Steam backup? Here’s how to check your version: here are the most helpful ones: