[Certification] Remove compatibility code for Python 2 from models

courses/certification/models.py

@@ -83,9 +83,6 @@ class CourseCertification(models.Model):
     class Meta:
         verbose_name = _("Certificate")
 
-    def __unicode__(self):
-        return u'({0}): {1}'.format(self.course_student, self.is_valid)
-
     def __str__(self):
         return '({0}): {1}'.format(self.course_student, self.is_valid)
 
@@ -117,9 +114,6 @@ class Evaluation(models.Model):
     class Meta:
         verbose_name = _('Evaluation')
 
-    def __unicode__(self):
-        return u'({0}): {1}'.format(self.klass, self.instructions)
-
     def __str__(self):
         return '({0}): {1}'.format(self.klass, self.instructions)
 
@@ -192,10 +186,6 @@ class CertificationProcess(models.Model):
     class Meta:
         verbose_name = _("Certification Process")
 
-    def __unicode__(self):
-        return u'({0}): {1}'.format(
-            self.course_certification.course_student.user, self.evaluation)
-
     def __str__(self):
         return '({0}): {1}'.format(
             self.course_certification.course_student.user, self.evaluation)