[i18n] chromeos login i18n-content to $i18n{}

chrome/browser/resources/chromeos/login/accessibility_menu.html

 <div id="accessibility-menu" class="bubble faded" hidden>
   <div class="checkboxrow">
     <input id="spoken-feedback" type="checkbox">
-    <label for="spoken-feedback" class="checkboxlabel"
-        i18n-content="spokenFeedbackOption">
+    <label for="spoken-feedback" class="checkboxlabel">
+      $i18n{spokenFeedbackOption}
     </label>
   </div>
   <div class="checkboxrow">
     <input id="large-cursor" type="checkbox">
-    <label for="large-cursor" class="checkboxlabel"
-        i18n-content="largeCursorOption">
+    <label for="large-cursor" class="checkboxlabel">
+      $i18n{largeCursorOption}
     </label>
   </div>
   <div class="checkboxrow">
     <input id="high-contrast" type="checkbox">
-    <label for="high-contrast" class="checkboxlabel"
-        i18n-content="highContrastOption">
+    <label for="high-contrast" class="checkboxlabel">
+      $i18n{highContrastOption}
     </label>
   </div>
   <div class="checkboxrow">
     <input id="screen-magnifier" type="checkbox">
-    <label for="screen-magnifier" class="checkboxlabel"
-        i18n-content="screenMagnifierOption">
+    <label for="screen-magnifier" class="checkboxlabel">
+      $i18n{screenMagnifierOption}
     </label>
   </div>
   <div class="checkboxrow">
     <input id="virtual-keyboard" type="checkbox">
-    <label for="virtual-keyboard" class="checkboxlabel"
-        i18n-content="virtualKeyboardOption">
+    <label for="virtual-keyboard" class="checkboxlabel">
+      $i18n{virtualKeyboardOption}
     </label>
   </div>
   <div id="close-accessibility-menu" class="close-button"
        i18n-values="title:closeAccessibilityMenu" tabindex="0">
   </div>
 </div>