Fixed #29953 -- Added CSS class to column headers in tabular inlines.

The class name is the same as one given to the fields in the change list.

tests/admin_inlines/models.py

@@ -152,6 +152,7 @@ class Poll(models.Model):
 
 
 class Question(models.Model):
+    text = models.CharField(max_length=40)
     poll = models.ForeignKey(Poll, models.CASCADE)