Update and rename en_US.lang to es_AR.lang

I hope I did this properly! PMs in Minecraft Forums are playing tricks on me! It's not showing my sent messages, or new messages [I feel super grandma right now]. 

Regards, 

Inés.
Mark tile entities as non-updating
Merge remote-tracking branch 'ines-aguirre/patch-1'
Undo removal of english language file