old_contents: from django.contrib import admin
  from django.contrib.admin import ModelAdmin
  from suit.admin import SortableTabularInline
  
  from models import *
  
  admin.site.register(TimtecUser)
  admin.site.register(Video)
  admin.site.register(CourseProfessor)
  
  class LessonInline(SortableTabularInline):
      model = Lesson
      sortable = 'position'
  
  class CourseAdmin(ModelAdmin):
      inlines = (LessonInline,)
  
  admin.site.register(Course, CourseAdmin)
  admin.site.register(Lesson)
  admin.site.register(Activity)
  admin.site.register(Unit)
  admin.site.register(Answer)
new_contents: from django.contrib import admin
  from django.contrib.admin import ModelAdmin
  from django.contrib.auth.admin import UserAdmin
  from suit.admin import SortableTabularInline
  
  from models import *
  
  admin.site.register(TimtecUser, UserAdmin)
  admin.site.register(Video)
  admin.site.register(CourseProfessor)
  
  class LessonInline(SortableTabularInline):
      model = Lesson
      sortable = 'position'
  
  class CourseAdmin(ModelAdmin):
      inlines = (LessonInline,)
  
  admin.site.register(Course, CourseAdmin)
  admin.site.register(Lesson)
  admin.site.register(Activity)
  admin.site.register(Unit)
  admin.site.register(Answer)
subject: Fix user admin