Refactor revision dropdown translation 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=321197) </details> <!--IssueSummary end--> The following discussion from !52967 should be addressed: - [ ] @jivanvl started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52967#note_506411821): > **Suggestion (optional)** I noticed there's a fair bit of translations happening for this file, a pattern that we find useful in CI is to consolidate all of the strings marked for translation inside a custom option, an example of this pattern can be seen in this file > > https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/assets/javascripts/threat_monitoring/components/policy_editor/policy_alert_picker.vue#L7
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