Fix `config/locale` path in README
Fix `config/locale` path in README

Should be `config/locales/en.yml`
thenthen8515/formtastic,ConferenceCloud/formtastic,justinfrench/formtastic,ryanfox1985/formtastic,paulodiovani/formtastic,paulodiovani/formtastic,thenthen8515/formtastic,mikz/formtastic,sideci-sample/sideci-sample-formtastic,Davidzhu001/formtastic,Guestfolio/formtastic,Guestfolio/formtastic,Davidzhu001/formtastic,ryanfox1985/formtastic,EndingChaung/formtastic,mikz/formtastic,ryanfox1985/formtastic,nishaya/formtastic,EndingChaung/formtastic,justinfrench/formtastic,justinfrench/formtastic,ConferenceCloud/formtastic,nishaya/formtastic