Fix duplicate tags by using the name as the id

Created by: Tirokk

Authored by roschaefer May 23, 2019 Merged May 28, 2019

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@ulfgebhardt: I wondered about the list of tags after importing the legacy db. It seems, each tag has at most 1 contribution. I guess it's because we create a unique id for each tag, so two tags with the same name e.g. #hashtag and #hashtag are not de-duplicated.

I'm currently sitting in the train and cannot run the data import myself, could you double-check?

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