One of the reasons that I love free / libre / open source is its high acceptance of Esperanto as an interface language. I myself also helped translate bunch of them (now I am searching for money to pay others to translate them :).

Facebook had a program of volunteer translations years ago. I helped a bit by rating existing translations. Then some law came that prevented for-profit corporations to use volunteers as translators and the program was shut down. Similar with Google, who still has parts of interface in Esperanto. Rumors go that Gmail was once fully translated into Esperanto, but the political decision went to not deploy it...