I think Angular 6 will add “improvements” in the internationalization/translations. It seems that it gonna be possible to better load a language at boot time (I insist on the “it seems” or “maybe”, I really don’t have that much face in Angular and Internationalization I’ve to say, really disappointed by the solution they propose so far) and not to have to bundle different version of the app to support different languages, something like that. There is a great feed in https://github.com/ngx-translate/core/issues/783 about the future of ngx-translate and what will happens with angular. If you would be agree to support the guy behind ngx-translate, send him some kudos posts in this Github topic.
Regarding Stencil, I have published an update of my app which use my web component built with Stencil (https://github.com/peterpeterparker/web-photo-filter) in both Android and iOS stores. My tests on both types of devices were fine and so far I didn’t get an Sentry notifications that sh*ts in production happened, so I’m pretty happy 