Add reviewers selection to new pull request (#32403)

Users could add reviewers when creating new PRs.

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Co-authored-by: splitt3r <splitt3r@users.noreply.github.com>
Co-authored-by: Sebastian Sauer <sauer.sebastian@gmail.com>
Co-authored-by: bb-ben <70356237+bboerben@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

options/locale/locale_en-US.ini

@@ -1462,7 +1462,7 @@ issues.new.closed_milestone = Closed Milestones
 issues.new.assignees = Assignees
 issues.new.clear_assignees = Clear assignees
 issues.new.no_assignees = No Assignees
-issues.new.no_reviewers = No reviewers
+issues.new.no_reviewers = No Reviewers
 issues.new.blocked_user = Cannot create issue because you are blocked by the repository owner.
 issues.edit.already_changed = Unable to save changes to the issue. It appears the content has already been changed by another user. Please refresh the page and try editing again to avoid overwriting their changes
 issues.edit.blocked_user = Cannot edit content because you are blocked by the poster or repository owner.