Payments forms currently focus on the first_name field when the form is loaded
For Japan forms (example) we switched the order of first name 名 and last name 姓（苗字） fields. However it is still the first_name field which is autofocused when the page loads. This means users will have to go backwards to fill out the last_name field.
We should focus on the first field in the form, instead of the first_name field specifically.
Change #1212196 had a related patch set uploaded (by Damilare Adedoyin; author: Damilare Adedoyin):
[mediawiki/extensions/DonationInterface@master] Refactor focus on first field on payment form to ensure the focus is actually placed on the first field.
Change #1212196 merged by jenkins-bot:
[mediawiki/extensions/DonationInterface@master] Refactor focus on first field on payment form to ensure the focus is actually placed on the first field.