To allow your phone to auto-correct in the right language take the following steps:

• Go to the Settings app on your iPhone or iPad
• Tap General
• Tap Dictionary
• Tap the language of which you would like to have the dictionary e.g. Spanish and Spanish-English. Then go back to the General Settings
• Tap Keyboard
• Tap keyboards
• Tap add New Keyboard
• Tap the language of your choice e.g. Spanish 
• Exit the Settings app on your device

 To see if it works take the following steps:

• Open Microsoft Translator
• Tap the keyboard icon
• You will see a small globe at the left of your space bar
• Tap and hold the globe and you will see list of languages appear. If you choose Spanish, you'll notice that the phrase you type is now autocorrected in Spanish.