Use better language strings (e.g. not espanol EE. UU.)

[arsalansufi]

VxScan: In Spanish extra grande this screen gets messed up

Issue automatically created from Slack feedback reported by caroline:
https://votingworks.slack.com/archives/CJU9MSC6S/p1728411606729629?thread_ts=1728411606.729629&cid=CJU9MSC6S

[mattroe]

Determine if it's easy to remove EE UU string. Can punt to v4.1 if needed.

[kofi-q]

FWIW, the language name strings are ultimately configured in the election package via VxDesign, if that influences prioritisation/inclusion in the 4.0 milestone

[arsalansufi]

Oh good catch @kofi-q! Yeah in that case I'm going to tag this with the outside-certified-system label and no need for you to spend any time on this