forms,templates: move error message about missing course upper, and make it red

fixes #4028

polynum_blackboard/forms.py

@@ -130,6 +130,12 @@ laquelle vous souhaitez diffuser votre document')
         self.helper.layout = Layout(
             Field('copyright', css_class="span12"),
             Field('licence', css_class="span12"),
+            HTML('''
+{% if form.course_name.errors %}
+<div class="alert-error">
+  {{ form.course_name.errors }}
+</div>
+{% endif %}'''),
             HTML('<script>var licence_pks_with_mycourse_tag = [%s];</script>' %
                     ', '.join(map(str, licence_pks_with_mycourse_tag))),
             Fieldset(u'Diffusion sur la plate-forme MyCourse',

polynum_blackboard/templates/_select_my_course.html

@@ -1,9 +1,4 @@
 {% load url from future %}
-{% if wizard.form.course_name.errors %}
-<div class="alert">
-  {{ wizard.form.course_name.errors }}
-</div>
-{% endif %}
 <style>
   .type-ue .controls button {
     height: auto;