A very informative flow chart.
@trinityblair that's bullshit.
Simplest use: in a chatroom where everyone can write in their own language you can now have a little translation button.
And suddenly the Arabic and Korean letters are translated. (Not always 100% accurate, because context matters, but still.)
Only Seeing those languages makes this chatroom more diverse. (Even if 80-90% of the people could theoretically write in English.)
