In Hopes of Attracting Foreign Audiences, Broadway Tries a Translation App
wsj.com
wsj.com
I'm not sure if translations are the best way to go about attracting foreign audience. There isn't a solution that I can provide, and my situation is truly anecdotal.
I like the solution the Komische Oper Berlin uses. Individual displays for every seat, switchable between German, English, French and Turkish (and off):
https://www.tagesspiegel.de/kultur/uebersetzerstuehle-multif...