Add a string externalisation in note form

What does this MR do?

After talking to @leipert & working on Crowdin for a bit, I noticed that this string was missing there. So this is a stab at making this string (and others like in the future) available for translation.

I saw the does not apply cleanly to the current EE/master warning in the failed pipeline's log. Will try to add that.

What are the relevant issue numbers?

#4012 (moved), https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24331

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
  • Well, to the internationalization guideline I hope, but because the example there is a line of JavaScript, not JSON, I'm not 100% sure, TBH.
• Conforms to the style guides
  • see above
• [-] Conforms to the merge request performance guidelines
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer