Fix issue #1852 - comma not recognized as a separator character #1913
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The comma is a very common word separator used in dates with short or long month names (see issue #1852); so it should be part of the characters, recognized as word separators.
When fixing this issue, I noticed that the characters used as word separators in 'formattingTokens' (split format string into tokens) and 'matchWord' (find separators between date parts) differ: the underscore was missing in 'formattingTokens' - fixed that too.