Impossible to copy internationalized fields

[rijk]

This was originally reported in #528, but I'm posting it here as I think it is an issue with the copy format.

On fields using the (official) internationalized array approach, they are impossible to copy-paste as that loses the associated _keys, where the language of the data is stored.

I am quite bummed the localization is not standard built-in functionality in Sanity. That was one of my main doubts when choosing Sanity as CMS, and this was exactly the type of issue I was afraid of.

By the way, when debugging I noticed that the keys aren't included in the copy-paste format — it's quite basic actually. Just a comma-separated list of values, with no indication of field names, types, or keys:

Item 1 NL, Item 1 EN, normal, Item 1 NL portabletext, Item 1 EN portabletext, normal, Item 2 NL, Item 2 EN, Item 2 FR, Item 2 NL portabletext, normal

This is copied from this field:

So I think this plugin will never be able to fix this, as it's impossible to infer the language from the data copied.

Originally posted by @rijk in #87