Fix SKOS-XL tooltips

[joelit]

Reasons for creating this PR

SKOS-XL tooltips worked only partially; there was a duplicate functionality, which meant that in some parts Skosmos could show only literal values for SKOS-XL tooltips.

Link to relevant issue(s), if any

• Closes Popup for SKOS-XL labels not always populated #1263

Description of the changes in this PR

Removed the duplicate functionality. Now also IRI values are displayed in SKOS-XL tooltips.

Known problems or uncertainties in this PR

None.

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)

[codecov]

Codecov Report

Merging #1317 (e34ba25) into master (a54f285) will increase coverage by 0.31%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master    #1317      +/-   ##
============================================
+ Coverage     70.36%   70.68%   +0.31%     
+ Complexity     1649     1646       -3     
============================================
  Files            32       32              
  Lines          3790     3786       -4     
============================================
+ Hits           2667     2676       +9     
+ Misses         1123     1110      -13     

Impacted Files	Coverage Δ
model/ConceptPropertyValueLiteral.php	95.65% <80.00%> (+25.65%)	⬆️

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[joelit]

Rebased and force-pushed. Draft-PR to get test a coverage report.

[osma]

I tested this with a small snippet of DiGA and it seems to work fine!

• Please make sure the alt tags are translated, as indicated in the comments.
• Please rename the PR so it has a more human-friendly title.

Other than these, looks very good to me!

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
1 Security Hotspot
0 Code Smells

No Coverage information
0.0% Duplication

[osma]

LGTM!