There was a problem with the portuguese locale.
The locale was pt-BR, but `globalize_accessors` gem
doesn't allow the creation of methods using locales
with that format.
To avoid transforming pt-BR to pt and lose the distinction
of the different variations of the language, a function has
been added to transform pt-BR into pt_br (without changing
the locale itself). That way, when globalize uses the locales,
all of them will have a valid format (downcased and underscored)
AND they will be always the same (comparing pt-BR with pt_br
doesn't work).
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