Add namespace for all related approval rules text

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Let's update all related approval rules text. The namespace I used is ApprovalRule|...

The following discussion from !47475 (merged) should be addressed:

• @mlunoe started a discussion: (+4 comments)

  Suggestion: Should we add a namespace to this translation?

  Suggestion: Should we move these to a constants file?

  More detail here: https://docs.gitlab.com/ee/development/i18n/externalization.html#vue-files