Improve language of email notifications of MR and Issue reassignment

What does this MR do?

Improve language of email notifications of MR and Issue reassignment

Are there points in the code the reviewer needs to double check?

Check if the link gets passed correctly

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32531 (closed)

@smcgivern Can you take a look at this? This is my first try at CE codebase and hence has every chance to be screwed up somewhere. I am not sure how we test email notifications, so I couldn't do the testing.

PS: If this turns out to be useless, please close the MR. :)

/cc @marin

changed milestone to %9.3

Closing as already fixed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11238

closed