This is a very easy fix.. My phone was doing this today too.
It also affects the text recognition (if you want to make a text message using your voice)
Here's what you need to do.
Open something so you can type a message (like a text message)
open your VIRTUAL keyboard.
when it's open at the bottom next to the space bar there is the key for , (coma)
Next to it there is a globe looking thing with lettering in it.. mine said ES which basically meant any autocorrect or voice recognization was going to be in spanish.. click it a bunch of times till it gets back to EN and everything should be normal.
Hope that solves your problem. again mine was doing the same thing.. language options said english and all.