Added strings of i18n and made the pin-keyboard work for rtl lang.

chrome/browser/resources/settings/people_page/people_page.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.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-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dialog/paper-dialog.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/people_page/sync_page.html">
 <link rel="import" href="/people_page/profile_info_browser_proxy.html">
@@ skipping 144 matching lines @@
           </div>
         </div>
 
 <if expr="chromeos">
         <!-- TODO(jdufault): Confirm if this goes above or below easy unlock
              settings. -->
         <template is="dom-if" if=[[pinUnlockAllowed_]]>
           <div class="settings-box">
             <!-- TODO(jdufault): i18n -->
             <p>Quick Unlock PIN</p>
-            <pin-keyboard></pin-keyboard>
+            <pin-keyboard placeholder="$i18n{pinKeyboardPlaceholderPin}">

[jdufault, 2016/06/28 23:06:10]

Drop this change; placeholder should be driven by the pin-keyboard element and
not externally modifiable.

[sammiequon, 2016/06/29 19:44:08]

Done.

+            </pin-keyboard>
           </div>
         </template>
 
         <div class="settings-box">
           <settings-checkbox pref="{{prefs.settings.enable_screen_lock}}"
               label="$i18n{enableScreenlock}">
           </settings-checkbox>
         </div>
 
         <template is="dom-if" if="[[easyUnlockAllowed_]]">
@@ skipping 102 matching lines @@
 
 <if expr="chromeos">
     <template is="dom-if" if="[[easyUnlockEnabled_]]">
       <easy-unlock-turn-off-dialog id="easyUnlockTurnOffDialog">
       </easy-unlock-turn-off-dialog>
     </template>
 </if>
   </template>
   <script src="people_page.js"></script>
 </dom-module>