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_1365569


Bráulio Bhavamitra

to remove accents, you may use `ActiveSupport::Inflector.transliterate` and then `downcase`

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