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_1365949


Bráulio Bhavamitra

@larissa ok, I did it (utf8 downcase) once with https://rubygems.org/gems/utf8

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