Add Northern Sámi (se) UI translation

[osma]

Reasons for creating this PR

Northern Sámi translation (ISO 639-1 code se) by Mari Guttorm and Siri K. Gaski is now available in Transifex. This PR adds it into the Skosmos codebase.

Link to relevant issue(s), if any

n/a

Description of the changes in this PR

• Add .po and .mo files for Northern Sámi

Known problems or uncertainties in this PR

The translation is in draft status, it's possible that some translations need to be further refined.

Checklist

• phpUnit tests pass locally with my changes
• 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)
• 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)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[sonarqubecloud]

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 #1353 (18e5380) into master (14d24cd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1353   +/-   ##
=========================================
  Coverage     70.68%   70.68%           
  Complexity     1646     1646           
=========================================
  Files            32       32           
  Lines          3786     3786           
=========================================
  Hits           2676     2676           
  Misses         1110     1110           

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