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

[Larissa Reis]

New comment for Merge Request 563

https://gitlab.com/noosfero/noosfero/merge_requests/563#note_1366198


Larissa Reis

@brauliobo but why would we add a new dependency if `#mb_chars` works just fine? :) 

Do you see a specific reason not to use it?

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