MD Settings: simplify language model and data binding

chrome/browser/resources/settings/languages_page/language_detail_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://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="languages.html">
 
 <if expr="chromeos">
@@ skipping 49 matching lines @@
           </cr-policy-pref-indicator>
         </label>
         <span hidden$="[[detail.language.supportsUI]]">
           $i18n{cannotBeDisplayedInThisLanguage}
         </span>
       </div>
 </if>
       <div class="list-item"
           hidden$="[[shouldHideTranslate_(
               detail.language.code, prefs.translate.enabled.value)]]">
-        <paper-checkbox checked="[[detail.state.translateEnabled]]"
+        <paper-checkbox checked="[[detail.translateEnabled]]"
             on-change="onTranslateEnabledChange_"
             hidden$="[[!detail.language.supportsTranslate]]"
             disabled="[[isTranslateDisabled_(
                 detail.language.code, languages.translateTarget)]]">
           $i18n{offerToTranslateInThisLanguage}
         </paper-checkbox>
         <div hidden$="[[detail.language.supportsTranslate]]">
           $i18n{cannotTranslateInThisLanguage}
        </div>
       </div>
     </div>
   </template>
   <script src="language_detail_page.js"></script>
 </dom-module>