Specifying the language of the email address did not make much sense
to start with, even if EDS does (did?) it that way originally. Akonadi
strips LANGUAGE=en. Instead of filtering that out for Akonadi, better
simplify the test data.
Only the first VEVENT of each item seem to be stored.
Avoid testing anything related to RECURRENCE-ID in
the import tests and skip the linked items tests.
