tests/test-locale.t

rhg: Rename cat_file_is_modified

It hasn’t been based on the "cat operation" for some time already.

Differential Revision: https://phab.mercurial-scm.org/D11773

  $ LANG=nonexistent LC_ALL=nonexistent LANGUAGE=nonexistent hg version -q
  Mercurial Distributed SCM (version *) (glob)