Fix DateOnly, TimeOnly & DateTime issues in French

[louis-z]

• Add DateToOrdinalWordsTests, TimeOnlyHumanizeTests & TimeToClockNotationTests for French culture
• Adapt code so that tests pass

Relates to #1081
Relates to #1134 (comment)
Fixes #1012

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[louis-z]

@mr-aboutin, @aloisdg, I've tried to address some of your concerns. Let me know what you think.