[Feat]: add e2e test for display-language patch

[jsjoeio]

What is your suggestion?

Add an e2e test for our display-language patch.

Why do you want this feature?

To prevent a regression like this which happened in 4.5.0

Are there any workarounds to get this functionality today?

Manually testing

Are you interested in submitting a PR for this?

Yes.

[jsjoeio]

Upstream has made a fix that will make our patch irrelevant. See: microsoft/vscode#82595 (comment)

Therefore, we should hold off on this.

[jsjoeio]

my sense is to avoid an e2e test for now since hopefully upstream's implementation will be done soon
but i think if it is not done say a week before our next release we go ahead and add the e2e test so we can have it for the next release

[jsjoeio]

Thinking out loud how to write the e2e test:

1. load code-server with language pack extension (i.e. Spanish) (similar to this)
2. configure display language (select from command palette?)
3. assert text "Explorar" or something in Spanish