Fix French decimal separator and apply to naturalsize

[SpiliosDimakopoulos]

Re: #51

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (c3a124c) to head (9190d01).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          12       12           
  Lines         913      915    +2     
=======================================
+ Hits          909      911    +2     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.59% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	97.59% <100.00%> (+<0.01%)	⬆️
windows-latest	95.73% <50.00%> (+<0.01%)	⬆️

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[codspeed-hq]

Merging this PR will degrade performance by 10.29%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 14 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	test_naturalsize	62.1 µs	69.2 µs	-10.29%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing SpiliosDimakopoulos:fix-51-naturalsize-french-decimal (9190d01) with main (c3a124c)}

[hugovk]

The decimal separator was set to . in #248, although https://en.wikipedia.org/wiki/Decimal_separator#Countries_using_decimal_comma says France and Canada (when using French) use ,

@merwok Shall we use , for French?

[hugovk]

@SpiliosDimakopoulos Why did you close this?

[merwok]

Definitely need , for fr_FR!