Fixes Argentina's currency.

[BartoGabriel]

Currency symbol is '$'. The symbol is placed before the number.

Closes #8583

[mary-poppins]

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[BartoGabriel]

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[lgalfaso]

this does not look like the right patch as these files are auto-generated

[jeffbcross]

@lgalfaso is right. But what's confusing is that it looks like the currency is correct in Closure Library, and has been since the inception of the repository: https://github.com/google/closure-library/blob/86920016968c1ee9c9f3ba202be8b22b5c641c8c/closure/goog/i18n/currency.js#L220

But for some reason our script is not using that value.

[jeffbcross]

Closing this PR since this should be fixed upstream. Leaving the original issue open though.

[lgalfaso]

@jeffbcross I am not sure this is an issue at the Closure Library, Argentina's currency symbol is at numberformatsymbolsext.js and not at numberformatsymbols.js, we only import the first one. Now, we do import datetimeSymbols.js and datetimeSymbolsExt.js, so we end up generating the 'es_AR' locale as we have the date, but not with the correct currency symbol.

As pointed out at #8583 (comment) it would be best to go strait to the CLDR and generate the locales from there, but I think it would take a lot of time with very little benefit