Cherry-pick-of: #16146
We use SIL EuroLatin as fallback keyboard. If that is not installed,
previously we output an error which showed up as a toast for the user.
This change now outputs a warning instead of the error for the default
keyboard.
Also changed the KeyboardHarness test app to set a different keyoard as
default.
Keyman makes it possible for you to type in any language on Windows, macOS, Linux, iPhone, iPad, Android tablets and phones, and even instantly in your web browser. Create keyboard layouts with Keyman Developer and share them with the community in the keyboards repository. The Keyman Community have already contributed keyboard layouts for over 2,000 languages!
License
Copyright (c) SIL Global.
Keyman is an open source project distributed under the MIT license.