email: Move and rename invite_email templates.

tools/check-templates

@@ -154,7 +154,7 @@ def check_html_templates(templates, all_dups):
         'templates/confirmation/confirm.html',
         'templates/confirmation/confirm_email_change.html',
         'templates/zerver/emails/confirm_new_email.html',
-        'templates/confirmation/invite_email.html',
+        'templates/zerver/emails/invitation.html',
         'templates/zerver/emails/confirm_registration.html',
         'templates/corporate/zephyr-mirror.html',
         'templates/corporate/zephyr.html',

zerver/lib/actions.py

@@ -3064,7 +3064,7 @@ def do_send_confirmation_email(invitee, referrer, body):
     if referrer.realm.is_zephyr_mirror_realm:
         template_prefix = 'confirmation/mituser_invite_email'
     else:
-        template_prefix = 'confirmation/invite_email'
+        template_prefix = 'zerver/emails/invitation'
 
     Confirmation.objects.send_confirmation(
         invitee, template_prefix, invitee.email, additional_context=context,