The locale is a global state, and it was not properly reset to
whatever it was before the unitttest possibly changed it.
This is now fixed.
Not restoring the locale led to weird issues: depending on
the order chosen by "python -m unittest discover" to run
the unit tests, some tests would apparently randomly fail
due to the locale not being what was expected.
For example, test_period_in_timeperiod_archive would
call mock('posts/1970/ 1月/index.html',...) instead of
expected mock('posts/1970/Jan/index.html',...) and fail.
We'll get better failure messages if we use an assertion method that
understands the comparison we're trying to make. If you make the
comparison by hand and assertTrue(), you don't get much constructive
feedback ;).
When importing from Wordpress, the --dir-page directive (disabled by
default) automatically adds files to the pages/ when they are recognised
as pages, as opposed to posts.
