Small fixes

main/utils.py

@@ -2,4 +2,4 @@ def format_username(firstname, lastname):
     first = firstname.lower().strip().replace(" ", "")[:6].encode('ascii', 'ignore')
     last = lastname.lower().strip().replace(" ", "")[:6].encode('ascii', 'ignore')
 
-    return "{}{}".format(first, last)
+    return "{0}{0}".format(first, last)