Added portuguese vocabulary

[diogomfarinha]

This fork contains added vocabulary for the portuguese language and corresponding new english expressions.

[codecov]

Codecov Report

Merging #498 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #498   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files         302      302           
  Lines        2459     2459           
=======================================
  Hits         2336     2336           
  Misses        123      123

Impacted Files	Coverage Δ
dateparser/data/date_translation_data/pt.py	100% <ø> (ø)	⬆️
dateparser/data/date_translation_data/en.py	100% <ø> (ø)	⬆️

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[Gallaecio]

Please, see https://dateparser.readthedocs.io/en/latest/contributing.html#guidelines-for-editing-translation-data