I shall answer all your questions.
if you registered English copy of the game.. when you re-download/re-install.. it will be in English just like how it is in NA. the keyboard setting is tied to your PC's keyboard setting. one thing you need to do is to highlight/enable other language in your Duty Finder setting otherwise the DF will search pure English party for you.. which means you will wait in quene FOREVER.
I am located in NJ,USA, which is very close to the original NA server before it moved to CA. BUT I have been playing on Tonberry, a JP server for 2 years now.. the connection is fine at 180~220 ping. You don't get instant feedback from server but the delay is not nearly as bad as what people sad. I haven't get knocked over by anything for a long time now. (I was knocked out by titan the first 3 times I fought him becasue I was not used to the initial ping change.)
use boarderless setting. bookmark google translate on the google search page (instead of the webpage of the google translate) you can copy & paste Party Finder comment. (SE put this in 2 patches go and I was super excited because now I can translate them) you can also highlight chat, Ctrl+C to copy them.
I use the google translate on the search page because you can hit the left/right arrow and start typing English and have it translated into Japanese for you. (this can not be done in the google translate webpage.) but be warned... the google translate is not almighty... use simple word like "bathroom" instead of "oh man.. I am not really well.. i need to take a big one on the toilet" my friend laugh at the translate that came out from google translate all the time... lol
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