Update glossary_tooltip.html to include relLangURL for $external_link

[Andygol]

This fine-tuning will help to avoid explicit manual language prefixing for the full_link. This change does not affect already language prefixed full_link (e.g. zh-cn)

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[sftim]

/area localization

[Andygol]

cc @nate-double-u @niranjandarshann

[Andygol]

@nate-double-u Could you have a look at this PR? 🙏

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4a43e43facd4fb6d7003ebf3b489bbca41ef4d63

[Andygol]

Is there anyone who would approve this PR? 🙏

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divya-mohan0209

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