Fix: Multilingual prefLabel(s) are captured incorrectly

[mdorf]

This PR addresses #228
It requires a corresponding PR in the https://github.com/ncbo/ontologies_api project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.08%. Comparing base (3aadf69) to head (0598b9f).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #229      +/-   ##
===========================================
- Coverage    81.08%   81.08%   -0.01%     
===========================================
  Files           74       74              
  Lines         5251     5250       -1     
===========================================
- Hits          4258     4257       -1     
  Misses         993      993              

Flag	Coverage Δ
unittests	81.08% <100.00%> (-0.01%)	⬇️

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