Add Swedish translation

[kess]

Add Swedish translation.

[codecov-commenter]

Codecov Report

Merging #217 (342c0ec) into master (aa0dd3d) will decrease coverage by 1.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
- Coverage   99.68%   97.78%   -1.90%     
==========================================
  Files           9        9              
  Lines         632      632              
==========================================
- Hits          630      618      -12     
- Misses          2       14      +12     

Flag	Coverage Δ
GHA_Ubuntu	97.78% <ø> (-0.64%)	⬇️
GHA_Windows	?
GHA_macOS	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_i18n.py	88.88% <0.00%> (-11.12%)	⬇️
src/humanize/i18n.py	90.38% <0.00%> (-7.70%)	⬇️

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[hugovk]

Tack!