Corrected date format for Portuguese (both locales)

[rafasoares]

Short date formats in Portuguese (both in Portugal and Brazil) are expressed as dd/MM/yyyy (http://en.wikipedia.org/wiki/Date_format_by_country). I've updated the symbols to reflect that.

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CLAs look good, thanks!

[lgalfaso]

The locales are generated automatically from https://github.com/google/closure-library/blob/master/closure/goog/i18n/datetimesymbols.js please post your patch there.
I will keep this issue open to track the generation of the locales once this is fixed there.

[rafasoares]

Ok, I've submitted a pull resquest there as well.

Thanks!

[petebacondarwin]

@lgalfaso rather than leaving this issue open, I am going to close it; @rafasoares please open a new issue once the locales have been updated in closure.