Add french localisation for NumberToWords

[Tradioyes]

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

[Tradioyes]

Nevermind, I'm a newbie here, I close this PR to create another one properly merged with recent commits

[thunsaker]

I was about to say, the easiest way would be to pull the relevant strings out and apply to a new updated branch. This project has been moving very fast the last few days. 😃

[MehdiK]

Thanks for the contribution. No need to close. You should be able to fetch the latest and rebase:

git checkout master
git pull upstream master
git rebase master FrenchNumberToWords

If rebase fails with merge conflicts:

// to fix the merge conflicts
git mergetool

// to continue with the rebase
git rebase --continue

[Tradioyes]

I already created PR #190 last night after closing this one. Thanks for the howto though 😃