add an Asian (Japanese) language install test
    
    Summary:
    Include some basic testing of Japanese input, and split the
    input testing (including Russian) into a separate module, since
    it's not really part of 'login' testing.
    
    Test Plan:
    Run the test, and the Russian and French tests too to
    make sure they didn't break. Tested on staging. Note the Japanese
    test soft fails, intentionally, at present, as I discovered a bug
    while working on it:
    https://bugzilla.gnome.org/show_bug.cgi?id=776189
    
    Reviewers: jskladan, garretraziel
    
    Reviewed By: garretraziel
    
    Subscribers: tflink
    
    Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D1072