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 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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