In this case the app developer is Google (News&Weather and navigation). So there's that.

And the stubbornness in refusing to add en_CA is confusing. How long could it take? At the risk of talking ill about my own employer (Android is a different team which I have no connection to tho) it seems rather culturally insensitive. I'd put the change together myself if I knew anything about it.

I should note that this is in stock Android on a Nexus. Motorola and others ship their Android with an en-CA locale.