My iphone 5's language in settings is set in english but it types in Chinese in Messages, google etc?
From Apple's support article: https://support.apple.com/en-us/HT202178

Change the language
If more than one language is on, you can change the language while typing.
Follow these steps:

Tap  to choose the next language on your keyboard. The chosen language appears on the Space bar.
Touch and hold  to display a menu of enabled keyboards. Drag to choose a new keyboard.

In iOS 6 and later, the language of the keyboard determines the language of the dictionary, if one is available for the language.