Add french localisation for NumberToWords

[Tradioyes]

• Added french (fr-FR) localisation & tests for NumberToWords
• Localized NumberToOrdinalWordsExtension, NumberToOrdinalWordsTests and
  DateTimeHumanizePrecisionStrategyTests

[Tradioyes]

I hope I did it right this time ^^
This is based on the more widely used spelling pre-1990 reform.

[thunsaker]

Are the "newer" forms (septante, nonante) used elsewhere, say in Belgium or Canada? Might we need a region check within the ToWords methods to account for these situations? I don't think they warrant a completely separate translation.

[thunsaker]

@Tradioyes also, would you feel comfortable adding those? Should someone from those regions localize the items mentioned?

[Tradioyes]

Septante and nonante are both used in fr-BE and fr-CH, octante is fr-CH only I think. These are not the newer forms, but country-specific.
I thought about those while doing mine, but as I'm not sure of other differences besides septante, octante and nonante, I just added fr-FR. I agree with you that they probably don't warrant another translation.
Again, these are not pre or post 1990 differences (french is just weird, and numbers are probably the simpler part).
The post 1990 reforrms basically added hyphens everywhere to composed numbers greater than 100, and it looks weird to most people. Per french academy standard, both hyphenated and non-hyphenated spellings are correct though (source).

[Tradioyes]

I just discovered that octante is belgian while huitante is swiss. Someone more comfortable than me with those variations should definitely do it ^^

[thunsaker]

In my brief study of French I was thrown by the counting after you get to soixante, I knew there were more Anglicized versions of seventy and such, but wow, regional differences, no wonder there are hundreds of ISO language codes.

[MehdiK]

Cool. Thanks for this. I made a few changes on your code, rebased, merged and pushed up. Please review my changes here.

For future contribution please check out the contribution guideline here.

[Tradioyes]

Great, thanks!

[MehdiK]

This is now published to NuGet as v1.21.1. Thanks.