mappings: fix issue with explicitLanguageTags set to true and label i…

[kouralex]

…s just shortened property; fix property text help

There was an unidentified case of #990 which was tried to be fixed with #998.
Fixes #990 for good.

For testing, see http://dev.finto.fi/gfdc/en/page/C861 and http://www.yso.fi/onto/yso/p105695.

Also, fixes an issue where a help text (tooltip) for property is shown even though there is no translation for it. See for example http://dev.finto.fi/gfdc/en/page/C861 -> tooltip of 'Related Matching Concepts'.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1012 into master will increase coverage by 0.03%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master    #1012      +/-   ##
============================================
+ Coverage     60.29%   60.32%   +0.03%     
- Complexity     1592     1593       +1     
============================================
  Files            32       32              
  Lines          4425     4429       +4     
============================================
+ Hits           2668     2672       +4     
  Misses         1757     1757              

Impacted Files	Coverage Δ	Complexity Δ
model/ConceptMappingPropertyValue.php	74.56% <83.33%> (+0.92%)	40.00 <0.00> (+1.00)

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[osma]

Looks OK. I don't have time to test it locally but I trust that you've tried it for yourself.