How Can I Change the Installer Language? 

- Launch Steam
- Click on the top left menu and select ‘Steam’ -> ‘Settings’
- Select the ‘Interface’ tab and change the language
- Click on OK
- Steam will ask you to restart its client: select ‘RESTART STEAM’ 
You can change the language of the game within Football Manager 2018 following these steps:
- Run the game
- From the Main Menu, select ‘Preferences’
- Under ‘Game Settings’, the language can changed to one of up to eighteen different languages (Czech, Dansk, English, English US, Español, Français, Greek, Italiano, Korean, Nederlands, Norsk, Polski, Português, Russian, Simplified Chinese, Traditional Chinese, Svenska, Turkish).