Update confirmation button variant and label

Changed the button variant in the confirmation popup of revoke authorized
application to danger variant (Red). Also, the label of the button is updated
to "Revoke application". Confirmation message in the popup has been
updated to "Are you sure you want to revoke this application?".

app/views/doorkeeper/authorized_applications/_delete_form.html.haml

@@ -5,4 +5,4 @@
 
 = form_tag path do
   %input{ :name => "_method", :type => "hidden", :value => "delete" }/
-  = submit_tag _('Revoke'), class: 'gl-button btn btn-danger btn-sm', data: { confirm: _('Are you sure?') }
+  = submit_tag _('Revoke'), class: 'gl-button btn btn-danger btn-sm', aria: { label: s_('AuthorizedApplication|Revoke application') }, data: { confirm: s_('AuthorizedApplication|Are you sure you want to revoke this application?'), confirm_btn_variant: 'danger' }

locale/gitlab.pot

@@ -5158,6 +5158,12 @@ msgstr ""
 msgid "Authorized applications (%{size})"
 msgstr ""
 
+msgid "AuthorizedApplication|Are you sure you want to revoke this application?"
+msgstr ""
+
+msgid "AuthorizedApplication|Revoke application"
+msgstr ""
+
 msgid "Authors: %{authors}"
 msgstr ""