Add balance_message method to MessageGenerator, accepting EBT and cash balances
Implement #balance_message for Spanish
Use MessageGenerator#balance_message for AK, CA, OK, PA, TX, and VA
Add tests for NC, OK, PA, VA and make PA not found response more flexible
Merge pull request #216 from codeforamerica/refactor-balance-messages-for-languages

Refactor state handlers to use message generator for balances