Internationalisation of lib directory - EE

Brandon Labuschagnerequested to merge
ee-js-i18n-lib into master

What does this MR do?

i18n the lib directory

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

This MR only targets the Vanilla JS files.

https://docs.gitlab.com/ee/development/i18n/externalization.html

Related issue is https://gitlab.com/gitlab-org/gitlab-ce/issues/59733

Originating CE MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27711

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