Add name to paths in edit label and milestone pages

Changelog: changed

app/views/admin/labels/edit.html.haml

 - add_to_breadcrumbs _("Labels"), admin_labels_path
+- add_to_breadcrumbs @label.name, admin_labels_path
 - breadcrumb_title _("Edit")
 - page_title _("Edit"), @label.name, _("Labels")
 %h1.page-title.gl-text-size-h-display

app/views/groups/labels/edit.html.haml

 - add_to_breadcrumbs _("Labels"), group_labels_path(@group)
+- add_to_breadcrumbs @label.name, group_labels_path(@group)
 - breadcrumb_title _("Edit")
 - page_title _("Edit"), @label.name, _("Labels")
 - show_lock_on_merge = @group.supports_lock_on_merge?

app/views/groups/milestones/edit.html.haml

 - breadcrumb_title _("Edit")
-- page_title _("Milestones")
-
-- render "header_title"
+- add_to_breadcrumbs _('Milestones'), group_milestones_path(@group)
+- add_to_breadcrumbs @milestone.title, milestone_path(@milestone)
+- page_title _('Edit'), @milestone.title, _('Milestones')
 
 %h1.page-title.gl-text-size-h-display
   = _('Edit milestone')

app/views/projects/labels/edit.html.haml

 - add_to_breadcrumbs _("Labels"), project_labels_path(@project)
+- add_to_breadcrumbs @label.name, project_labels_path(@project)
 - breadcrumb_title _("Edit")
 - page_title _("Edit"), @label.name, _("Labels")
 - show_lock_on_merge = @project.supports_lock_on_merge?

app/views/projects/milestones/edit.html.haml

 - breadcrumb_title _('Edit')
 - add_to_breadcrumbs _('Milestones'), project_milestones_path(@project)
+- add_to_breadcrumbs @milestone.title, milestone_path(@milestone)
 - page_title _('Edit'), @milestone.title, _('Milestones')
 
 %h1.page-title.gl-text-size-h-display