Language and currency are based on your local phone settings.

You can change your local currency in your phone settings. You can do this in you settings and local phone options,
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​Read more information for the Android platform
​https://support.google.com/travel/answer/7378789?hl=en&co=GENIE.Platform%3DAndroid

Read more information for the IOS platform
​https://support.apple.com/en-us/HT201389