See page http://userguide.icu-project.org/locale#TOC-Examples section on "Level 1 cannonicalization" which we are not doing it seems.

calendarLanguage="en-US" should be cannonicalized by ICU to "en_US", which it then should find it the list of available locales.

This should fix IBM tests test_simple_type_properties_text_calendar_13_01 through _04, which are failing because they have "en-US".