Add Intl ctors; remove Intl prototypes

[Elchi3]

Background mdn/sprints#2571

PluralRules and RelativeTimeFormat already have constructor data, so there I just removed the prototype entry.

[wbamberg]

This looks fine except for what looks like one copy/paste error for DateTimeFormat's "description".

The URLs here are like:
"/JavaScript/Reference/Global_Objects/Collator/Collator". From mdn/sprints#2537 (comment) I had thought we would nest these objects in their namespace, which would give us URLs like "/JavaScript/Reference/Global_Objects/Intl/Collator/Collator". Or is that for a next step?

[Elchi3]

This looks fine except for what looks like one copy/paste error for DateTimeFormat's "description".

Great catch, thank you! I've fixed this.

The URLs here are like:
"/JavaScript/Reference/Global_Objects/Collator/Collator". From mdn/sprints#2537 (comment) I had thought we would nest these objects in their namespace, which would give us URLs like "/JavaScript/Reference/Global_Objects/Intl/Collator/Collator". Or is that for a next step?

I would say lets do this in a next step. The constructor work took already longer than I thought, so the Intl moves should be looked at separately. I will do that this sprint if the other scheduled work items will be done early, but otherwise I plan to get to it next sprint.

[wbamberg]

Thanks for the update, @Elchi3 . Looks good to me!