diff --git a/stages/admin.py b/stages/admin.py
index cc886b9..7b2922c 100644
--- a/stages/admin.py
+++ b/stages/admin.py
@@ -13,6 +13,12 @@ class StudentAdmin(admin.ModelAdmin):
     fields = (('last_name', 'first_name'), ('pcode', 'city'),
               'birth_date', 'klass', 'archived')
 
+    def get_readonly_fields(self, request, obj=None):
+        if 'edit' not in request.GET:
+            return self.fields
+        else:
+            return self.readonly_fields
+
 
 class ReferentAdmin(admin.ModelAdmin):
     list_display = ('__unicode__', 'abrev')
@@ -93,6 +99,10 @@ class AvailabilityAdmin(admin.ModelAdmin):
         return super(AvailabilityAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)
 
 
+class TrainingAdmin(admin.ModelAdmin):
+    search_fields = ('student__first_name', 'student__last_name', 'availability__corporation__name')
+
+
 admin.site.register(Section)
 admin.site.register(Level)
 admin.site.register(Klass)
@@ -103,4 +113,4 @@ admin.site.register(CorpContact, CorpContactAdmin)
 admin.site.register(Domain)
 admin.site.register(Period, PeriodAdmin)
 admin.site.register(Availability, AvailabilityAdmin)
-admin.site.register(Training)
+admin.site.register(Training, TrainingAdmin)
diff --git a/stages/models.py b/stages/models.py
index 4bd5a90..9c8330e 100644
--- a/stages/models.py
+++ b/stages/models.py
@@ -28,6 +28,7 @@ class Level(models.Model):
 
     class Meta:
         verbose_name = "Niveau"
+        verbose_name_plural = "Niveaux"
 
     def __unicode__(self):
         return self.name
diff --git a/stages/static/js/attribution.js b/stages/static/js/attribution.js
index e1dec15..28d18cf 100644
--- a/stages/static/js/attribution.js
+++ b/stages/static/js/attribution.js
@@ -193,8 +193,10 @@ $(document).ready(function() {
 
           // Update referent select
           var parsed = $('#referent_select option:selected').text().match(/(.*)\((\d+)\)/);
-          $('#referent_select option:selected').text(parsed[1] +' (' + (parseInt(parsed[2]) + 1) + ')');
-          $('#referent_select').val('');
+          if (parsed) {
+            $('#referent_select option:selected').text(parsed[1] +' (' + (parseInt(parsed[2]) + 1) + ')');
+            $('#referent_select').val('');
+          }
 
           update_trainings($('#period_select').val());
         }
diff --git a/stages/views.py b/stages/views.py
index 27cd89a..981b359 100644
--- a/stages/views.py
+++ b/stages/views.py
@@ -71,7 +71,7 @@ class AttributionView(TemplateView):
 def section_periods(request, pk):
     """ Return all periods from a section (JSON) """
     section = get_object_or_404(Section, pk=pk)
-    periods = [(p.id, p.dates) for p in section.period_set.all()]
+    periods = [(p.id, p.dates) for p in section.period_set.all().order_by('start_date')]
     return HttpResponse(json.dumps(periods), content_type="application/json")
 
 def section_classes(request, pk):