The currency you see in the Gameloft Club webstore depends on the Region settings of your device.

To change the currency, please follow the steps below.
After the change is done, please wait a bit (5-10 minutes) for it to be applied and restart the game.

iOS:
Settings → General → Language & Region → Region

Android:
The exact steps might vary slightly depending on your Android device model or operating system version. You may need to navigate through additional menus or settings options.

Settings → System → Languages & input → Languages

If no language is added, usually English (United States) is added by default.
For some languages, such as English, which can be spoken in different countries, or which have dialects, you can select a Region.

Windows:
Settings → Time & language → Language & region → Region → Country or region