Proposed change to navbar-lang-selector behavior

[paulofponciano]

Description

The current navbar-lang-selector behavior lists all languages in the dropdown even when no translations are available for the current page. When a user selects a language, they are redirected to that language's home page instead of a translated version of the current page.
This misleads users into thinking translations exist for the page, and they only discover it's a fallback behavior after being redirected to the home page.

Proposed changes in this PR:

• Only display the dropdown when translations actually exist for the current page
• Show just the language name (without dropdown) when no translations are available (EN default language)

Repo file: /layouts/partials/navbar-lang-selector.html

Example pages with current behavior (EN only at this time):

• https://kubernetes.io/docs/concepts/scheduling-eviction/gang-scheduling/
• https://kubernetes.io/docs/tasks/configure-pod-container/resize-pod-resources/

The same pages can be used to evaluate the new behavior in staging.

Issue

Closes: #53803

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