Well I just blew a whole day trying to add WatchConnectivity, only to come to this thread to find out my Watch App should've been dependent. So I'm stuck with: "[WC] WCSession counterpart app not installed", console message. Until Apple either gives me a way to change my Watch App to be a companion app and vice versa (since I seem to only get a one chance to make a business decision about this) I'm pausing development on the Apple Watch. Hopefully in the next WatchOS release they fix this!

Google provides an translation API, it would be great if Apple provided one so we wouldn't have to bother with 3rd party libs: https://www.appcoda.com/google-translation-api/