In this scenario, you must change the primary system language first. Navigate to the Game Settings tab.
Quick Overwatch Language Adjustment Tips
Note that some languages may require you to restart the game client fully for the changes to take effect on the character select screen and HUD. Look for Users and Accounts (or Profile & Parental Controls).
Changing the language in Overwatch is a straightforward process, but the exact steps depend on whether you are playing on PC, PlayStation, or Xbox. After the system language is updated, launching Overwatch will display the UI in the new language.
Quick Overwatch Language Adjustment Tips
Regional Servers and Language. Hover over the game tile for Overwatch and click the gear icon for Settings.
More About How to change language on overwatch
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