Add btn-default for cancel button in the issuable form

app/views/shared/issuable/_form.html.haml

@@ -64,11 +64,11 @@
 .row-content-block{ class: (is_footer ? "footer-block" : "middle-block") }
   .float-right
     - if issuable.new_record?
-      = link_to 'Cancel', polymorphic_path([@project, issuable.class]), class: 'gl-button btn btn-cancel'
+      = link_to _('Cancel'), polymorphic_path([@project, issuable.class]), class: 'gl-button btn btn-cancel'
     - else
       - if can?(current_user, :"destroy_#{issuable.to_ability_name}", @project)
         = link_to 'Delete', polymorphic_path([@project, issuable], params: { destroy_confirm: true }), data: { confirm: "#{issuable.human_class_name} will be removed! Are you sure?" }, method: :delete, class: 'btn btn-danger btn-grouped'
-      = link_to 'Cancel', polymorphic_path([@project, issuable]), class: 'gl-button btn btn-grouped btn-cancel'
+      = link_to _('Cancel'), polymorphic_path([@project, issuable]), class: 'gl-button btn btn-grouped btn-default btn-cancel'
 
   %span.gl-mr-3
     - if issuable.new_record?

changelogs/unreleased/btn-default-mr-cancel.yml

+---
+title: Add btn-default for cancel button in issueable form
+merge_request: 53458
+author: Yogi (@yo)
+type: other