[BUG] Internationalization not working

Describe the bug When changing the locale config from English to Chinese in the opensearch_dashboards.yml file, the application does not change language to Chinese but still showing the default language English.

To Reproduce Steps to reproduce the behavior:

1. Go to opensearch_dashboards.yml file
2. Scroll down to ‘i18n.locale’
3. Input “zh-CN”
4. Restart server and refresh the browser

Expected behavior Language for the Opensearch Dashboard should be changed from the default language English to Chinese as the comments saying “supported languages are the following: English - en, by default, Chinese -zh-CN” in the yml file.

Screenshots

Additional context Legacy application includes the supported translation functions in the X-pack folder, so we do not have access to it.

request:
curl 'http://localhost:5603/uev/translations/zh-cn.json' -H 'Accept: */*' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Referer: http://localhost:5603/uev/app/discover' -H 'Connection: keep-alive' -H 'Cookie:xxxxx' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache'

resp:
{"locale":"zh-CN","messages":{}}

[abbyhu2000]

One possible solution is to create a translation plugin.

[joshuarrrr]

We’ve created the i18n OpenSearch Dashboards plugin to provide this functionality.