Spanish translation

Following the translation manual @gunchleoc (sorry for the inconveniences)

I already finished with the .po file but have a question about the Spanish translation, since the most common way to group up the different styles for each region is two, one for the Spanish of Spain and other for the Spanish of Latin America.

But the site have MX for Mexican Spanish and ES for Spain Spanish and since there isn't an ISO 639-1 or ISO 639-2 code for Latin America Spanish only found one using the IETF language tag which is es-419 (Spanish appropriate for the Latin America and Caribbean region, using the UN M.49 region code). This code is compatible with the others in the site or is better to use a tag for my country version of Spanish?

I'm asking this because in my opinion could be better for the future translations and translators of the site to work together on just one translation for the Latin America version instead one for each country of the region, but I'm understand if this can't be implemented because isn't compatible.