Merge pull request #225 from rfellows/develop

[BISERVER-10966] - Internationalization using locale with country code not working
BISERVER-7981 - 404 message for pentaho/mantle/messages/messages_supported_languages.properties

fixed for LoginMessages_supported_languages.properties
Merge pull request #227 from aliakseihaidukou/BISERVER-7981

BISERVER-7981 - 404 message for pentaho/mantle/messages/messages_support...
[PDI-11553] - Refactor the accordion-based layout
Adding CSS styling for angular-directives.
Changed the buildSummary method to onSave.
Added onCancel.