Add Swedish translation for docs components

[OskarPersson]

Translates the components provided by Read the Docs Sphinx Theme.

The files were created using the method described here

[codecov]

Codecov Report

Merging #310 into master will increase coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
+ Coverage    54.7%   54.92%   +0.22%     
==========================================
  Files         159      159              
  Lines       11477    11555      +78     
  Branches     1488     1491       +3     
==========================================
+ Hits         6278     6347      +69     
- Misses       5007     5016       +9     
  Partials      192      192

Flag	Coverage Δ
#backend	54.92% <ø> (+0.22%)	⬆️

Impacted Files	Coverage Δ
ESSArch_Core/auth/admin.py	70.53% <0%> (+8.57%)	⬆️

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