[i18n] 6.7.2 error in starting up kibana with Chinese locale

[Bamieh]

@Conky5 caught an error while spinning the environment for the Chinese locale in 6.7.2 this means that the current kibana does not startup in Chinese if Chinese locale is selected.

https://github.com/elastic/infra/issues/9691#issuecomment-485474696

Fix here: #35461

[alexfrancoeur]

I realize this is listed as 6.7.2 but can we also test and make sure this bug does not affect 7.0 after this has been resolved? @jinmu03 had also run into this issue on 7.0. I wonder if we need to backport there as well?

[jinmu03]

@alexfrancoeur it should be zh-CN instead of zh_CN. Cloud whitelisted only locales with _ as separator

[Bamieh]

@alexfrancoeur good point. its only affecting this specific version.

[liza-mae]

I have added automation scripts for this specific case, it would be nice to add some UI checks too, we can look into that later. This is being added for on-prem release testing.

It was not clear to me what needed to be done for cloud, one of the comments said the validator is currently broken on cloud, will follow up and add a test when needed.

If there are other settings or scenario that need be automated, let me know. Thanks.

cc: @joegallo, @epixa, @vogxn

[Bamieh]

@liza-mae Thanks for getting on top of this.

I believe we need two simple smoke tests:

1. kibana startup succeeds in each locale
2. check kibana loading screen is being displayed in each corresponding locale, (or login page). Checking 1 locale might be enough for this smoke test to pass.

If the second point needs some effort i believe the first point is good as a starting place.

We are still fixing an issue in Cloud for localization to get it working, but we'll need a test or two for that soon.