KNL-1297 Number format fails in assignments 

git-svn-id: https://source.sakaiproject.org/svn/assignment/trunk@314953 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-27939 Setting default grade to 0 crash in spanish

git-svn-id: https://source.sakaiproject.org/svn/assignment/trunk@314954 66ffb92e-73f9-0310-93c1-f5514f145a0a