Change TimeOnly.ToClockNotation to accept culture

[RenNagasaki]

There are cases where your UI culture is not the culture you want to get the clock notation for. Added the functionality for that. Existing implementations should not be influenced.

For me the problematic part is: I use the DefaultTimeOnlyToClockNotationConverter for english clock notation but my UI culture is 'de-DE'. I get for 08:15 -> 'a quarter past acht' instead of 'a quarter past eight'

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