Localization support

[scarf005]

find locale set with sys-locale, then format with locales.

---

TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry

[codecov-commenter]

Codecov Report

Merging #820 (9630013) into master (ea56a7c) will increase coverage by 0.02%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master     #820      +/-   ##
==========================================
+ Coverage   86.57%   86.60%   +0.02%     
==========================================
  Files          44       45       +1     
  Lines        4507     4515       +8     
==========================================
+ Hits         3902     3910       +8     
  Misses        605      605              

Impacted Files	Coverage Δ
src/meta/inode.rs	87.50% <ø> (ø)
src/meta/links.rs	87.50% <ø> (ø)
src/meta/date.rs	94.53% <83.33%> (+0.17%)	⬆️
src/meta/locale.rs	100.00% <100.00%> (ø)
src/meta/mod.rs	54.18% <100.00%> (ø)
src/meta/name.rs	90.41% <100.00%> (ø)
src/meta/symlink.rs	82.75% <100.00%> (ø)
src/sort.rs	99.49% <100.00%> (ø)
tests/integration.rs	100.00% <100.00%> (ø)

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[zwpaper]

thanks for your help! @scarf005