feat(lang): add Estonian (et) translations

[Pikse]

Description

New translations.

[welcome]

💖 Thanks for opening this pull request! 💖

Things that will help get your PR across the finish line:

• Run npm run lint -- --errors locally to catch formatting errors earlier.
• Include tests when adding/changing behavior.
• Include screenshots and animated GIFs whenever possible.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[mister-ben]

I don't speak Estonian, but looks good from a quick Google Translate sanity check. Thanks!

[codecov]

Codecov Report

Merging #7745 (bb30237) into main (0543298) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #7745   +/-   ##
=======================================
  Coverage   80.90%   80.90%           
=======================================
  Files         116      116           
  Lines        7457     7457           
  Branches     1806     1806           
=======================================
  Hits         6033     6033           
  Misses       1424     1424           

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[welcome]

Congrats on merging your first pull request! 🎉🎉🎉