Use explicit $.parseHTML() to avoid JS syntax error

[osma]

Reasons for creating this PR

The hierarchy in the IPTC vocabulary wasn't working - it gave a JS parse error. This PR fixes the problem by explicitly calling the jQuery function $.parseHTML() instead of relying on the magic $() function.

Link to relevant issue(s), if any

• Closes JavaScript error on hierarchy sort #1270

Description of the changes in this PR

• use explicit $.parseHTML() call

Known problems or uncertainties in this PR

n/a

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if not, explain why below)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1316 (8782ebb) into master (712ead2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1316   +/-   ##
=========================================
  Coverage     70.36%   70.36%           
  Complexity     1649     1649           
=========================================
  Files            32       32           
  Lines          3790     3790           
=========================================
  Hits           2667     2667           
  Misses         1123     1123           

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