Add a test for Greek letters
Add a test for Greek letters

In 00abe551fd0c98a88c5447106e30545b234319f4 we added support for
transliterating Greek letters. This commit adds a test to ensure that
protected food & drink names made entirely of Greek letters get a
suitable base_path which was the original issue we were seeing.

alphagov/specialist-publisher,alphagov/specialist-publisher,alphagov/specialist-publisher