My messages are being corrected in the wrong language

Hello, i just bought an iPhone 6 with iOS 8.4 in France. I am from the U.S. but currently live in France.

My iPhone language is set to English, I send messages in both English and French.

My problem is that when I send a message in English it is corrected in French.

I have two questions: 1- How can I change to correction in English?

2- Is there a fast way to change the correction according to the language that I am using?

In advance thank you for any help solving my problem.