I agree with Vojtech, this should be classified as a bug rather than Suggestion.

This is something that is a major issue for us regarding international customers, in 2024 it should be possible to generate responses based on users system/browser language.
Even incoming domains like mail.es/fr/dk/com could be valid alternatives to base a reply on.

this is not a feature request, this is a bug

This is really frustrating that email notifications do not reflect the detected language. DO we really need to make automation rules with langue IF clauses to make this work? 

I think this is a very important feature to have. We support thousands of customers world wide, and if a French user gets an English e-mail, often they're gone.

It would be great if we could attach an email template to a JQL query (same as with the SLA feature), so you can also change email templates based on other properties than language alone.

PUSH!

I think this feature is essential to having a functional multilingual setup with Jira Service Management.

If you use Jira Service Management with multiple languages where people create issues by email then this feature is essential.

One could argue: What is the point of detecting the request language and having multilingual support, if the email notification does not reflect that? How many Customers in Jira Service Management would create a user, log-in and change their language? I suspect only a few - if any.

I hope you will implement this feature!

PS If you see this thread and would also like this feature, please vote for it and perhaps share your thoughts in a comment, to gain attention from Atlassian and increase the probability of this feature being implemented.