Microsoft Lumia 640 XL

Find "language"

Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.

Find "language"

Press language.

Select language

If the language isn't displayed on the list of languages:
Press and hold the required language until a pop-up menu is displayed.

Select language

Press move up.
Repeat this until the language is at the top of the list.

Select language

If the language isn't displayed on the list of languages:
Press add languages.

Select language

Press the required language.

Select language

Press the confirm icon.

Select language

Press restart phone.
Wait a moment while your phone is restarted.