format balance

app/models/user.rb

@@ -44,7 +44,7 @@ class User < ActiveRecord::Base
     end
   end
 
-  def debt
+  def balance
     @balance || begin
       headers = {
         "Authorization" => "Token token=#{Rails.application.secrets.tab_api_key}",

app/views/layouts/_header.html.haml

@@ -42,7 +42,7 @@
                 %li= link_to "Edit avatar", edit_user_path(current_user)
             %li
               %p.navbar-text
-                Debt: #{euro(current_user.debt)}
+                Balance: #{euro_from_cents(current_user.balance)}
         .visible-xs.navbar-form
           .form-group
             - if user_signed_in?