Improve delete webhook modal copy

Changelog: changed

app/views/shared/web_hooks/_hook.html.haml

@@ -22,4 +22,4 @@
     .col-md-4.col-lg-5.text-right-md.gl-mt-2
       %span>= render 'shared/web_hooks/test_button', hook: hook, button_class: 'btn-sm btn-default gl-mr-3'
       %span>= link_to _('Edit'), edit_hook_path(hook), class: 'btn gl-button btn-default btn-sm gl-mr-3'
-      = link_to _('Delete'), destroy_hook_path(hook), data: { confirm: _('Are you sure?') }, method: :delete, class: 'btn gl-button btn-secondary btn-danger-secondary btn-sm'
+      = link_to _('Delete'), destroy_hook_path(hook), aria: { label: s_('Webhooks|Delete webhook') }, data: { confirm_btn_variant: "danger", confirm: s_('Webhooks|Are you sure you want to delete this webhook?') }, method: :delete, class: 'btn gl-button btn-secondary btn-danger-secondary btn-sm'

locale/gitlab.pot

@@ -40283,6 +40283,9 @@ msgstr ""
 msgid "Webhooks|An issue is created, updated, closed, or reopened."
 msgstr ""
 
+msgid "Webhooks|Are you sure you want to delete this webhook?"
+msgstr ""
+
 msgid "Webhooks|Comments"
 msgstr ""
 
@@ -40292,6 +40295,9 @@ msgstr ""
 msgid "Webhooks|Confidential issues events"
 msgstr ""
 
+msgid "Webhooks|Delete webhook"
+msgstr ""
+
 msgid "Webhooks|Deployment events"
 msgstr ""