Improve default locale path discovering.

[mondeja]

Changes proposed in this pull request:

• Default locale path only is computed when humanize.i18n.activate function is called.
• Handle __file__ is None and __file__ not defined cases.
• Add tests cases increasing code coverage.

[codecov-commenter]

Codecov Report

Merging #146 into master will increase coverage by 0.57%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #146      +/-   ##
===========================================
+ Coverage   99.42%   100.00%   +0.57%     
===========================================
  Files           9         9              
  Lines         524       554      +30     
===========================================
+ Hits          521       554      +33     
+ Misses          3         0       -3     

Flag	Coverage Δ
#GHA_Ubuntu	100.00% <100.00%> (+0.57%)	⬆️
#GHA_Windows	100.00% <100.00%> (+0.57%)	⬆️
#GHA_macOS	100.00% <100.00%> (+0.57%)	⬆️

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Impacted Files	Coverage Δ
src/humanize/i18n.py	100.00% <100.00%> (+7.50%)	⬆️
tests/test_i18n.py	100.00% <100.00%> (ø)
src/humanize/time.py	100.00% <0.00%> (ø)
src/humanize/number.py	100.00% <0.00%> (ø)

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[hugovk]

Thanks for the PR!

Just a few minor suggestions :)

[mondeja]

All resolved, seems that coverage upload is failing...

[hugovk]

Thanks! Yeah, the coverage upload has been a bit flaky of late, nothing to worry about here. I've restarted the CI (but it might fail again 🙃).

[hugovk]

Thank you!