Added Estonian localisation

[zcribe]

Adapted version of hungarian locale.

[Syeberman]

@zcribe, thanks for the patch! The build is currently failing as there's some untested code in your submission. Can you add a few more tests that target _format_timeframe?

[zcribe]

I do not actually understand what additional tests it wants me to write. Any insight into this would be greatly appreciated.

[Syeberman]

I believe, since all your timeframes are dicts, you just need to remove the if isinstance(form,dict): line. Code coverage is likely telling you that the isinstance check is unnecessary.

[codecov-io]

Codecov Report

Merging #518 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #518   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          14     14           
  Lines        3230   3288   +58     
  Branches      231    232    +1     
=====================================
+ Hits         3230   3288   +58

Impacted Files	Coverage Δ
arrow/locales.py	100% <100%> (ø)	⬆️
tests/locales_tests.py	100% <100%> (ø)	⬆️

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[Syeberman]

Thanks again, @zcribe!