fix: issue1895197 - translated help texts in admin.py not displayed correctly. Adjust the technique used to remove the translated "Usage:" prefix from the printed line. Support Chinese (zh) as well. Add coding marker so I don't have to modify the tests to skip the ones that touch the dmin module.

try:
    # Python 2.
    my_input = raw_input
except NameError:
    # Python 3+.
    my_input = input