Client default settings

Go to the client profile you need, scroll down to the Default settings section, and press "Change default settings":

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It will display the Change default settings page where you can set your client's default currency, payment conditions, and the locale of invoices:

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Note: The necessary payment methods can be created in the Payment methods settings.

PDF locale of client invoices

By default, the system uses the locale (language, date and time) of invoices specified in the "Default settings" of your account whenever client invoices are generated.

But here you may define the different one only for this particular client.

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Note: The PDF locale setting defined in a specific client's profile overrides the default one specified in the account default settings.