allow emergency fee

public/views/preferencesFee.html

@@ -7,8 +7,16 @@
 
 <div class="content preferences" ng-controller="preferencesFeeController as prefFee">
   <div ng-repeat="fee in prefFee.feeOpts" ng-click="prefFee.save(fee)" class="line-b p20 size-14">
-    <span>{{fee.name|translate}} (<span translate>{{fee.value}} bits per kB</span>)</span>
+    <span ng-if="fee.red" style="color:red">{{fee.name|translate}} (<span translate>{{fee.value}} bits per kB</span>)</span>
+    <span ng-if="!fee.red">{{fee.name|translate}} (<span translate>{{fee.value}} bits per kB</span>)</span>
     <i class="fi-check size-16 right" ng-show="prefFee.feeName == fee.name"></i>
   </div>
+  <div class="row column m20t">
+    <div class="text-gray size-12 text-center m20b"  translate>
+      Bitcoin Transactions may include a fee that is collected by the miner that include it on a block. Higher the fee, higher is the incentive of the miners to include it. The 'Emergency' level should only be used when there is a network congestion.
+    </div>
+  </div>
+
 </div>
+
 <div class="extra-margin-bottom"></div>

src/js/controllers/preferencesFee.js

@@ -13,7 +13,11 @@ angular.module('copayApp.controllers').controller('preferencesFeeController',
     }, {
       name: gettext('Economy'),
       value: 10,
-    }];
+    }, {
+      name: gettext('Emergency'),
+      red: true,
+      value: 500,
+    }, ];
 
     this.save = function(newFee) {
       var opts = {