Support for custom locale validation messages

Issue type

I'm submitting a (check one): [ ] Bug report [x] Feature request [ ] Regression (something that used to work, but stopped working in a newer version) [x] Support request [ ] Documentation issue or request

Prerequisites

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Current behavior

Currently, we have support English and French validation messages. In addition, we can provide validation messages by using one of the 3 available methods i.e.

String: A plain text message, which is always the same.
String template: A text message that includes Angular template-style {{variables}}, which will be be replaced with values from the returned error object.
Function: A JavaScript function which accepts the error object as input, and returns a string error message.

Is there an option where in my custom widget component I can subscribe to a language change event and trigger and update to update the layoutNode's validationMessages?

Trying to support Spanish and a few other custom languages in my forms

 this.languageSwitch.currentLang
        .subscribe(data => {

         this.options.validationMessages.required = 'CUSTOM_LANGUAGE_STRING

      });

Expected behavior

IMPORTANT: How can we reproduce your problem?

Environment

OS name & version: Browser name & version: Angular version: Angular JSON Schema Form version(s): Other relevant software or packages:

Any other relevant information

In my custom widget I am subscribed to a language Subject Observable. When the SUBJECT emit's a new value I want to change the validation message to a custom string based on the emitted language code

dschnelldavis / angular2-json-schema-form