Fix regression tests to work in Welsh locale.

Welsh (cy_GB) apparently sorts 'dd' after 'f', creating problems
analogous to the odd sorting of 'aa' in Danish.  Adjust regression
test case to not use data that provokes that.

Jeff Janes

Patch: <CAMkU=1zx-pqcfSApL2pYDQurPOCfcYU0wJorsmY1OrYPiXRbLw@mail.gmail.com>