[MD settings] change i18n() use in html to $i18n

chrome/browser/resources/settings/system_page/system_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://md-settings/controls/settings_checkbox.html">
 <link rel="import" href="chrome://md-settings/prefs/prefs.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="chrome://md-settings/system_page/system_page_browser_proxy.html">
 
 <dom-module id="settings-system-page">
   <template>
     <style include="settings-shared">
       /* TODO(dbeam): is it worth generalizing this style? Does something like
        * this already exist (buttons after a checkbox in the same row)? */
       #hardware-acceleration {
         align-items: center;
         display: flex;
       }
 
       #hardware-acceleration settings-checkbox {
         flex: 1;
       }
     </style>
     <div class="settings-box block first">
 <if expr="not is_macosx">
-      <settings-checkbox i18n-values="label:backgroundAppsLabel"
+      <settings-checkbox label="$i18n{backgroundAppsLabel}"
           pref="{{prefs.background_mode.enabled}}">
       </settings-checkbox>
 </if>
       <div id="hardware-acceleration">
-        <settings-checkbox i18n-values="label:hardwareAccelerationLabel"
+        <settings-checkbox label="$i18n{hardwareAccelerationLabel}"
             pref="{{prefs.hardware_acceleration_mode.enabled}}">
         </settings-checkbox>
-        <template is="dom-if" if="[[shouldShowRestart_(prefs.hardware_acceleration_mode.enabled.value)]]">
+        <template is="dom-if" if="[[shouldShowRestart_(
+            prefs.hardware_acceleration_mode.enabled.value)]]">
           <paper-button on-tap="onRestartTap_">$i18n{restart}</paper-button>
         </template>
       </div>
     </div>
     <div class="settings-box">
       <div class="button-strip">
         <paper-button class="primary-button" on-tap="onChangeProxySettingsTap_">
           $i18n{changeProxySettings}
         </paper-button>
       </div>
     </div>
   </template>
   <script src="chrome://md-settings/system_page/system_page.js"></script>
 </dom-module>