Localize accessibility text in sidebar nav

[sftim]

Allow localizing labels that are used in the sidebar navigation to help accessibility.

Split out from #48721
/area localization
/area web-development

We could also contribute this to Docsy

[k8s-ci-robot]

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[dipesh-rawat]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b1dc02f12a78905ab7c91b0cca61c2a6bdab8e84

[Arhell]

lgtm

[k8s-ci-robot]

PR needs rebase.

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