Add ability to require invite request text (#15326)

Fixes #15273

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

config/locales/en.yml

@@ -586,6 +586,9 @@ en:
         min_invite_role:
           disabled: No one
           title: Allow invitations by
+        require_invite_text:
+          desc_html: When registrations require manual approval, make the “Why do you want to join?” invite request text mandatory rather than optional
+          title: Require new users to fill an invite request text
       registrations_mode:
         modes:
           approved: Approval required for sign up

config/settings.yml

@@ -70,6 +70,7 @@ defaults: &defaults
   spam_check_enabled: true
   show_domain_blocks: 'disabled'
   show_domain_blocks_rationale: 'disabled'
+  require_invite_text: false
 
 development:
   <<: *defaults