Fix for #1389 checking that skosxl properties are only shown for correct language

[henriyli]

Reasons for creating this PR

Bugfix

Link to relevant issue(s), if any

• Closes SKOSXL labels displayed multiple times #1389

Description of the changes in this PR

Adding a language check for displaying the skosxl properties to prevent showing properties for labels in other than intended language.

Known problems or uncertainties in this PR

Checklist

• [x ] phpUnit tests pass locally with my changes
• [x ] I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• [x ] The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• [x ] The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.52% 🎉

Comparison is base (a22b389) 69.55% compared to head (101a2d9) 70.08%.
Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1425      +/-   ##
============================================
+ Coverage     69.55%   70.08%   +0.52%     
- Complexity     1650     1658       +8     
============================================
  Files            32       32              
  Lines          4257     4272      +15     
============================================
+ Hits           2961     2994      +33     
+ Misses         1296     1278      -18     

Files Changed	Coverage Δ
model/ConceptPropertyValueLiteral.php	97.87% <100.00%> (+2.31%)	⬆️
model/LabelSkosXL.php	44.00% <100.00%> (+4.86%)	⬆️

... and 3 files with indirect coverage changes

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[osma]

Could you please add a unit test as well? (You have ticked the box, but there is no test.)

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
2 Security Hotspots
6 Code Smells

No Coverage information
0.0% Duplication

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
2 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[osma]

Very good, thanks a lot @henriyli ! I added a @covers annotation to get rid of a Codecov warning. Merging this now to the master branch, and I will also backport this fix to the v2.16-maintenance branch.

[osma]

Cherry-picked the commits to v2.16-maintenance as well.