Forex

[kyungmin]

DO NOT MERGE
Resolves #1085

Here are the changes in the dashboard for forex:

Activity view:

• Show original currency amount in the transactions table and USD converted amount

Debit details page:

• Show original currency amount in the debit details page and USD converted amount

Debit modal:

• Debit modal: When charging a card, the user can select the currency type

Refund modal:

• Refunds: The refund modal will display the original amount in the original currency. You can only refund in the original currency.
• We’ll also show a USD converted amount for the MP’s reference. (Currency conversion balanced-api#604)

Search:

• search for amount across all currencies (e.g. 10.00 returns USD and EUR if both exists) (Search and return conversion value from elastic search balanced-api#601)

Testing:

• Write tests
• Remove dummy data in app/models/transaction.js once the API is ready (Forex balanced-api#564)