Feature: API for updating account settings (#645)

* Feature: API for updating account settings

- API to update account locale
- API to update account name
- API to show account info

db/migrate/20200325210612_add_locale_to_account.rb

@@ -0,0 +1,5 @@
+class AddLocaleToAccount < ActiveRecord::Migration[6.0]
+  def change
+    add_column :accounts, :locale, :integer, default: 0
+  end
+end