We are seeing a number of Spanish speaking donors say they didn't respond to the survey as it was in English, but looking by their donation in Civi, they donated and received the TY email in Spanish, so we are assuming landed on the Spanish TY page.
There are a few of these, so it feels like something is up, but we are unable to replicate and so we are unsure how they are seeing the survey in English. Perhaps an issue with es-419?
Examples:
ZD 942185 / CID 27984307
ZD 943118 / CID 20756693
ZD 945407 / CID 2429385
ZD 942476 / CID 20726334
(there are more if you need them).