Summary:
Egyptian Arabic is a dialect of Arabic that is mostly a spoken language that is used in everyday communications.
This PR adds new locale to Arabic to support the differences between Modern Standard Arabic (MSA) and Egyptian Arabic (EG).
I have mainly depended on the different locales of Spanish that are supported by Duckling to create the new Egyptian Arabic locale.
New modifications are added to the `Numeral` dimension since I didn't spot differences in other dimensions.
Pull Request resolved: https://github.com/facebook/duckling/pull/554
Reviewed By: patapizza
Differential Revision: D25543502
Pulled By: chessai
fbshipit-source-id: 4cbb7be78a52071c8681380077f0b4dc033a60de
703ff13210