fix #1018 by explicitly declaring the UI locale in getDate()

[kouralex]

This PR fixes #1018 by declaring the UI locale in the getDate() method. This could, however, also be fixed by changing the signature of the method and passing the UI language parameter from the Twig template and, thus, making it more versatile, but because the method is not in use in anywhere else it can be fixed straightaway in code.

[sonarcloud]

SonarCloud Quality Gate failed.

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

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1024 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1024      +/-   ##
============================================
- Coverage     60.32%   60.31%   -0.02%     
+ Complexity     1593     1591       -2     
============================================
  Files            32       32              
  Lines          4429     4427       -2     
============================================
- Hits           2672     2670       -2     
  Misses         1757     1757              

Impacted Files	Coverage Δ	Complexity Δ
model/Concept.php	79.70% <100.00%> (-0.10%)	196.00 <0.00> (-2.00)

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[osma]

This simpler fix looks good. I've verified that it works locally. +1 for merging.

[osma]

I decided not to wait for @kouralex and just went ahead and merged this. Thanks!