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
Added new error message that displays when HTML5 video is not supported altogether. [BLD-638]
Error message is correctly displayed when HTML5 video is disabled by user
Added error message inside video tag instead. Hide spinner when no HTML5 video is defined or video tag not supported.
Removed exclamation point from error message.
Addressed comments.
Corrected acceptance test.
Added acceptance test on spinner visibility.
Set is_spinner_shown to method instead of property.