prefLabel used as key first

[francescalb]

Description

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.40%. Comparing base (f7dae75) to head (d7061ac).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #550      +/-   ##
==========================================
+ Coverage   85.38%   85.40%   +0.01%     
==========================================
  Files          30       30              
  Lines        5002     5007       +5     
==========================================
+ Hits         4271     4276       +5     
  Misses        731      731              

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