gnome-text-editor: handle 48 UI changes, update needles
    
    The 'settings' menu is replaced by an 'info' panel, and *most* of
    the things from 'settings' moved to 'preferences'. But Document
    Type is in the 'info' panel. Just to make things fun. The grid
    feature is gone. And of course all the needles needed updating
    for the new font. The flatpak build is still 47 and so has the
    old UI but the new font, and line spacing in it seems slightly
    different, so we need conditional paths and more needles. Yay.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>