Locale Filter test suite

The current locale filter tests don't exercise any of the
extended language range functionality, or using an empty
filter to exclude all translations.

It doesn't make a difference in generating the test output,
because that only tests applying the rules to get the data
categories, and not round-trip behavior based on them. But
for people like me who use the test suite as the basis for
their regression tests, it's really useful.

I've attached a proposed source XML file along with what I
believe is the correct test output for it. I can modify the
rest of the files if people agree.

--
Shaun