Add language data for whether an actor is unable to speak, read, or write in a language that they know

[krbz999]

A lot of actors have a note on languages such as "Understands Sylvan but cannot speak" or similar. Currently we input these in the languages.custom field, but this then appears as a language of its own. For example it would end up with both "Sylvan" and "(understands but cannot speak)". It would be good if each language had some further configuration available.

The data could possibly appear like,

"languages": {
  "value": [
    "common",
    "sylvan"
  ],
  "custom": "",
  "telepathy": {},
  "config": {}
}

where config would be an (extension of) ObjectField where users can define, for each language, whether they are unable to read, speak, and/or write it.

As for displaying it on the actor sheet, perhaps a similar method to what is currently done for physical damage bypasses (mgc, sil, ada) with icons rather than long-form notes.

Possibly related: #1982

[kaelad02]

What mechanical benefit does this provide over the custom field? I ask since language on the character sheet is just informational.

[krbz999]

What mechanical benefit does this provide over the custom field? I ask since language on the character sheet is just informational.

Improved display, easier and more uniform data-entry, and if the system or a module wants to make use of it in the future, that's an added bonus.

e: localization would also benefit.