Patch from Bug #28406:

Patch from Bug #28406:
    # the digitClass join versions were inverted: for a maxLength > 1 it should be
      (|||), not []
    # the regexp escape for digits in the ts_number_transform_table was a bit, er,
      strange. Although it worked, I think my version is more common.
    # most important: As recommended in http://en.wikipedia.org/wiki/Percent_sign,
      there may be some whitespaces between the number and the
      "%". See also Bug #15422 for that, I'm not sure wheter it's
      included there.

I didn't include the “non-breaking space is part of \s” bit since I didn't want to mess up browser bug work-arounds