Sidebar in the docs pages of I18nised site don't mark the non-translated menu items with `(EN)`

[SayakMukhopadhyay]

Creating this issue based on this conversation

@sftim I was going through the sidebar code and realised that the little (EN) in the sidebar menu for menu items not i18nised is no longer visible. It used to be as I can see in this preview https://deploy-preview-48741--kubernetes-io-main-staging.netlify.app/hi/docs/tutorials/configuration/configure-java-microservice/configure-java-microservice/ from #48741

Since the code is still there in the template but hidden from the SCSS, I was wondering if one of them is supposed to be removed.

Originally posted by @SayakMukhopadhyay in #49825 (comment)

[dipesh-rawat]

/area web-development
/priority backlog

[sftim]

/triage accepted
/kind bug
/remove-priority backlog
/priority important-longterm