from __future__ import unicode_literals vs. py2.5
python 2.6 is required for this future import.
for python 2.5 it'll just give:
SyntaxError: future feature unicode_literals is not defined (danish.py, line 1)
(seen on the shining panda python 2.5 based tests)
so, the question is: shall we rewrite the snowball modules and the lang.isri module so it does not use unicode_literals?