XLIFF 2.0 + ICU messages in Angular

Hi,

Angular, a very popular JavaScript framework, supports XLIFF 2.0 for internationalization. See https://angular.io/guide/i18n 

It is interesting to notice how Angular mixes XLIFF 2.0 with ICU Message Format for handling plurals and alternates. It places raw ICU notation in <source>, something that requires additional processing before translation.

I've got a sample file with XLIFF 2.0 that has some validation issues. It might be interesting to contact the i18n group at Angular and work with them on XLIFF 2.0 support.

Regards,
Rodolfo