noosfero | tags: migration to fix tags case differences (#563)

[Bráulio Bhavamitra]

New comment for Merge Request 563

https://gitlab.com/noosfero/noosfero/merge_requests/563#note_1365570


Bráulio Bhavamitra

other examples: https://github.com/coletivoEITA/IMD/blob/master/config/initializers/string.rb#L55

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