Develop to master merge, release 5.30.1

[alexskr]

Follow-up fixes for multilingual ontology support:

• Multilingual Ontologies: search returns array instead of a string. ontologies_linked_data#211
• Filter API Search with a language parameter ontoportal/ontoportal-project#56

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.64%. Comparing base (75b98e0) to head (237ecd5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   73.44%   73.64%   +0.19%     
==========================================
  Files          53       53              
  Lines        2922     2944      +22     
==========================================
+ Hits         2146     2168      +22     
  Misses        776      776              

Flag	Coverage Δ
unittests	73.64% <100.00%> (+0.19%)	⬆️

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