Fix missing argument for providing a custom locale when querying a date

[sprmn]

This is a fix for a piece of code that was missing in #2382. It enables the use of a locale argument of type GraphQLString in date queries, as suggested in #2382 (comment).

Now you can format the date in a query to another locale like this:

date(formatString: "DD MMMM YYYY", locale: "de")

This will result in a date value of 27 octobre 2017.

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[KyleAMathews]

Thanks!

[jlengstorf]

Hiya @sprmn! 👋

This is definitely late, but on behalf of the entire Gatsby community, I wanted to say thank you for being here.

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[stradaroca]

Thanks for the solution 🥇