Add "why do you want to join" field to invite requests (#10524)

* Add "why do you want to join" field to invite requests

Fix #10512

* Remove unused translations

* Fix broken registrations when no invite request text is submitted

app/views/admin/pending_accounts/_account.html.haml

@@ -1,14 +1,14 @@
 .batch-table__row
   %label.batch-table__row__select.batch-table__row__select--aligned.batch-checkbox
     = f.check_box :account_ids, { multiple: true, include_hidden: false }, account.id
-  .batch-table__row__content.batch-table__row__content--unpadded
-    %table.accounts-table
-      %tbody
-        %tr
-          %td
-            = account.user_email
-            = "(@#{account.username})"
-            %br/
-            = account.user_current_sign_in_ip
-          %td.accounts-table__count
-            = table_link_to 'pencil', t('admin.accounts.edit'), admin_account_path(account.id)
+  .batch-table__row__content.pending-account
+    .pending-account__header
+      = link_to admin_account_path(account.id) do
+        %strong= account.user_email
+        = "(@#{account.username})"
+      %br/
+      = account.user_current_sign_in_ip
+
+    - if account.user&.invite_request&.text&.present?
+      .pending-account__body
+        %p= account.user&.invite_request&.text