fixup! Message: Support ICU MessageFormat using slexaxton/messageformat.js

The link should go to https://github.com/SlexAxton/messageformat.js/#no-frills
or the specific formats below, since there's lots of other stuff that doesn't
matter for Globalize users.
fixup! Message: Support ICU MessageFormat using slexaxton/messageformat.js

Both of those can be demonstrated without using plural formats.