I18N JS files starting with u

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

This commit only targets Vanilla JS files.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html
99 jobs for js-i18n-u in 66 minutes and 12 seconds (queued for 15 seconds)
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