EZP-20979: enable Legacy Storage to implicitly create fields for main and initial language
EZP-20979: fixed: sortKeyInt is not nullable
Added comment and todo
EZP-20979: fixed field type not registered
EZP-20979: implement tests for passing non-redunant set of fields to storage
EZP-20979: update phpdoc
Merge pull request #396 from ezsystems/fix-EZP-20979-content-integration-tests

Fix EZP-20979: content integration tests