Test whether graphemes in the transcriptionsystems are all normalized

I realized this bug only coincidentally when adding more tests: if we have an "alias" in the transcriptionsystem, but this alias will never have a chance to occur, since it is also normalized, we have empty and unused data in our transcriptionsystem. This needs to be checked directly when submitting the data (it may be checked with the last test I added, but it's not entirely clear yet).