Yes, It is possible to set different default language.
Steps to set the Default language of Form other than English:
- Go to the About Update Client Details tab in the Update Client Details app.
- Click on Step 7 and select the language in the “Select Default Form Language” dropdown, and choose the language from the available options.
- Hit the Save Button
- Now the user will receive the Update form with the default language selected.

P.S. Discover Update Client Details, the easy way to keep client information up to date in Salesforce. Find it on AppExchange - https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000EcsATUAZ
