Changing 'po' flag to 'p' and adding desc for -v
Changing 'po' flag to 'p' and adding desc for -v

Changing 'po' to 'p' to conform to UNIX style.

maximilien/i18n4go,maximilien/i18n4go,mattn/i18n4go,mattn/i18n4go,maximilien/i18n4go