Add danish language

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (a3061c6) to head (f658015). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #244 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 22 22 Lines 2380 2380 ========================================= Hits 2380 2380 ```

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