Add namespace for all related approval rules text
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=288803) </details> <!--IssueSummary end--> Let's update all related approval rules text. The namespace I used is `ApprovalRule|...` The following discussion from !47475 should be addressed: - [ ] @mlunoe started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/47475#note_453627658): (+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
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