[MD settings] update i18n replacements in bluetooth settings

chrome/browser/resources/settings/bluetooth_page/bluetooth_add_device_dialog.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="chrome://md-settings/bluetooth_page/bluetooth_dialog_shared_css.html">
 <link rel="import" href="chrome://md-settings/icons.html">
 
 <dom-module id="settings-bluetooth-add-device-dialog">
   <template>
     <style include="settings-shared"></style>
     <style include="bluetooth-dialog-shared"></style>
     <div id="dialogOuterDiv" class="layout vertical flex">
       <div id="dialogHeaderDiv" class="settings-box layout horizontal">
-        <span id="dialogTitle" class="flex"
-            i18n-content="bluetoothAddDevicePageTitle">
+        <span id="dialogTitle" class="flex">
+          $i18n{bluetoothAddDevicePageTitle}
         </span>
         <paper-icon-button icon="settings:close" on-tap="onCancelTap_"
             id="close">
         </paper-icon-button>
       </div>
       <div class="settings-box flex">
         <div id="dialogDeviceList" class="settings-box layout vertical"
             on-device-event="onDeviceEvent_">
-          <span class="no-devices" hidden$="[[haveDevices_(deviceList)]]"
-              i18n-content="bluetoothNoDevices">
+          <span class="no-devices" hidden$="[[haveDevices_(deviceList)]]">
+            $i18n{bluetoothNoDevices}
           </span>
           <iron-selector class="flex">
             <template is="dom-repeat" items="[[deviceList]]"
                 filter="deviceNotPaired_" observe="paired">
               <bluetooth-device-list-item device="[[item]]">
               </bluetooth-device-list-item>
             </template>
           </iron-selector>
         </div>
       </div>
       <div id="dialogFooterDiv" class="layout horizontal center">
         <div id="scanning" class="layout horizontal center flex"
             hidden$="[[!adapterState.discovering]]">
           <paper-spinner active="[[adapterState.discovering]]">
           </paper-spinner>
-          <span i18n-content="bluetoothScanning"></span>
+          $i18n{bluetoothScanning}
         </div>
         <paper-button id="cancel" class="end-justified"
-            i18n-content="cancel" on-tap="onCancelTap_">
-        </paper-button>
+            on-tap="onCancelTap_">$i18n{cancel}</paper-button>
       </div>
     </div>
   </template>
   <script src="bluetooth_add_device_dialog.js"></script>
 </dom-module>