Improve i18n support on group labels page

Zhiyuan Lurequested to merge
gitlab-jh/jh-team/gitlab:enhance-i18n-on-group-labels-page into master

What does this MR do and why?

Improve i18n support on group labels page.

In non-English environment, English is still displayed in three places. As shown in the screenshot below.

Screenshots or screen recordings

Before After

cc @prajnamas @qt-gith

Edited by Zhiyuan Lu

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