SymbolicResponse fix error message.
Merge pull request #3716 from edx/anton/i18n-symbolic-response

SymbolicResponse fix error message.
ORA2 release 2014-05-19
Add Croatian language
Update translations (autogenerated message)
Merge pull request #3771 from edx/sarina/051914-language-update

Sarina/051914 language update
Merge pull request #3768 from edx/will/ora2-release-2014-05-19

ORA2 release 2014-05-19
Tolerance expressed in percentage now computes correctly. [BLD-522]
Modified and extended tests on percentage expressed tolerance.
Addressed comments.
All tests pass now.
Added tests for compare_with_tolerance
Put unit tests of util in their own file.