donationManager makes it simple for you to offer a French version of your donation form.
Adding the property of "&lang=fr" where you embed the donation form will
<iframe src="https://yourcompany.secure.force.com/Fundraising?mode=dm&lang=fr" width="100%" height="800px" frameborder="0" scrolling="false" align="center"> </iframe>
If your form allows donor to select a campaign to support, you can add the french campaign name on the campaign record. The field is Bilingual Campaign Name, you may need to add the field to your Campaign page layout.
We can enable a language preference on donation forms that donors can indicate their language preference for future communications.