add Latvian translation

[osma]

Reasons for creating this PR

There is a new UI translation to Latvian by @CaptSolo. This PR adds it to the Skosmos codebase so it is available by default.

Link to relevant issue(s), if any

• n/a

Description of the changes in this PR

• Add Latvian translation

Known problems or uncertainties in this PR

none

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #1313 (62a622e) into master (863b7cb) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1313      +/-   ##
============================================
- Coverage     69.44%   69.36%   -0.09%     
  Complexity     1656     1656              
============================================
  Files            32       32              
  Lines          4068     4057      -11     
============================================
- Hits           2825     2814      -11     
  Misses         1243     1243              

Impacted Files	Coverage Δ
model/resolver/WDQSResource.php	94.11% <0.00%> (-0.33%)	⬇️
model/sparql/JenaTextSparql.php	91.83% <0.00%> (-0.17%)	⬇️
model/sparql/GenericSparql.php	92.16% <0.00%> (-0.09%)	⬇️

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