Link to contact form in warning

app/controllers/courses_controller.rb

@@ -47,7 +47,13 @@ def show
       redirect_unless_secret_correct
       return if performed?
     end
-    flash[:alert] = I18n.t('courses.show.has_private_exercises') if current_user&.course_admin?(@course) && !@course.all_activities_accessible?
+    if current_user&.course_admin?(@course) && !@course.all_activities_accessible?
+      flash[:alert] = I18n.t('courses.show.has_private_exercises')
+      flash[:extra] = {
+        'message' => I18n.t('courses.show.has_private_help'),
+        'url' => contact_url
+      }
+    end
     @title = @course.name
     @series = policy_scope(@course.series).includes(:evaluation)
     @series_loaded = params[:secret].present? ? @course.series.count : 2

config/locales/views/courses/en.yml

@@ -89,6 +89,7 @@ en:
         contact_html: "<a href=\"%{contact_url}\">Contact us</a> if you want to delete the course anyway."
     show:
       has_private_exercises: "This course uses private exercises that it hasn't been granted the rights to."
+      has_private_help: "Contact us if you don't know how to solve this."
       course: Course
       hidden_show_link: "Secret link"
       visibility-visible_for_all-info: "This course is visible for everyone: everyone can access this course from the course overview, and the contents are visible for everyone."

config/locales/views/courses/nl.yml

@@ -97,6 +97,7 @@ nl:
         contact_html: "<a href=\"%{contact_url}\">Contacteer ons</a> als je de cursus toch wilt verwijderen."
     show:
       has_private_exercises: "Deze cursus gebruikt privé oefeningen waartoe die geen rechten heeft."
+      has_private_help: "Contacteer ons als je niet weet hoe je dit kan oplossen."
       course: Cursus
       hidden_show_link: 'Geheime link'
       visibility-visible_for_all-info: 'Deze cursus is zichtbaar voor iedereen: ze wordt opgelijst in het cursusoverzicht en de inhoud is toegankelijk voor iedereen.'