l.t.t.test_autoapproval : module documentation

Unit tests for translation import queue auto-approval.

This test overlaps with the one in doc/translationimportqueue.txt. Documentation-style tests go in there, ones that go systematically through the possibilities should go here.

Class	GardenerDbUserMixin	Switch to the translations import queue gardener database role.
Class	TestCustomLanguageCode	Unit tests for CustomLanguageCode.
Class	TestGuessPOFileCustomLanguageCode	Test interaction with TranslationImportQueueEntry.getGuessedPOFile.
Class	TestTemplateGuess	Test auto-approval's attempts to find the right template.
Class	TestKdePOFileGuess	Test auto-approval's POFile guessing for KDE uploads.
Class	TestGetPOFileFromLanguage	Test TranslationImportQueueEntry._get_pofile_from_language.
Class	TestCleanup	Test TranslationImportQueueEntry garbage collection.
Class	TestAutoApprovalNewPOFile	Test creation of new `POFile`s in approval.
Class	TestAutoBlocking	No class docstring; 3/21 methods documented