Update cached kiosk app crx from usb stick.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 5061 matching lines @@
   </message>
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_DOWNLOAD" desc="Error message used when a kiosk app fails to launch due to crx file download failure.">
     Kiosk application could not be downloaded.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_LAUNCH" desc="Error message used when a kiosk app fails to launch due to app launching failure.">
     Kiosk application could not be launched.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_USER_CANCEL" desc="Error message used when a kiosk app launch is canceled by user.">
     Kiosk application launch canceled.
   </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_IN_PROGRESS" desc="Message shown on screen when the system is updating kiosk apps from usb stick.">
+    Kiosk applications are being updated from usb stick, please wait. Do not remove the usb stick.
+  </message>  
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_NO_UPDATES" desc="Error message for no external extensions to update.">
+    No kiosk apps with newer version are found on the usb stick, nothing to update. Please remove the usb stick.
+  </message>  
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_NO_MANIFEST" desc="Error message for external update manifest file not found.">
+    Can't find kiosk external update manifest file on the usb stick, failed to update kiosk apps. Please remove the usb stick.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_INVALID_MANIFEST" desc="Error message for invalid external update manifest file from usb stick.">
+    Found invalid kiosk external update manifest file on the usb stick, failed to update kiosk apps. Please remove the usb stick.
+  </message>     
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_COMPLETE" desc="Message shown on screen when the system completes updating kiosk apps from usb stick.">
+    Kiosk app updating from usb stick is completed. Please remove the usb stick from the device.
+  </message>  
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_SUCCESSFUL_UPDATED_APPS" desc="Message shown for successfully updated kiosk apps.">
+    The following kiosk apps have been updated, please reboot the device to complete the update process: <ph name="updated_apps">$1<ex>PrintApp</ex></ph>.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_FAILED_UPDATED_APPS" desc="Message shown for failed updated kiosk apps.">
+    The following kiosk apps have been failed for updating: 
+  </message>    
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_BAD_CRX" desc="Error message for crx file unpacking failure.">
+    Bad crx file, unpacking failed.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_SAME_APP_VERSION" desc="Error message for external extension is the same version with existing one.">
+    External extension is at the same version with existing one.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_EXISTING_VERSION_NEWER" desc="Error message for external app version is older than the version of the existing one.">
+    External extension is in a version (<ph name="EXTERNAL_VERSION">$1<ex>1.0.0</ex></ph>) older than the version of the existing one (<ph name="EXISTING_VERSION">$2<ex>2.0.0</ex></ph>). 
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_INVALID_MIN_BROWSER_VERSION" desc="Error message for invalid minimum browser version from external extension.">
+    External extension has invalid minimum browser version data in manifest.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_REQUIRE_HIGHER_BROWSER_VERSION" desc="Error message for external extension requires higher version of chrome to be installed.">
+    The external extension requires chrome version <ph name="MINIMUM_CHROME_VERSION">$1<ex>1.0.0</ex></ph> or greater to be installed.
+  </message>
+  <message name="IDS_KIOSK_EXTERNAL_UPDATE_CANNOT_COPY_CRX" desc="Error message for not being able to copy kiosk external crx file to cache.">
+    Can't copy <ph name="EXTERNAL_CRX_FILE">$1<ex>/media/usb/app_v2.crx</ex></ph> to <ph name="CACHE_CRX_FILE">$2<ex>/home/chronos/kiosk/crx/app_v2.crx</ex></ph>.
+  </message>  
 
   <!-- About Chrome page -->
   <message name="IDS_UPGRADE_BUTTON" desc="The button label to check for updates and apply (download and install) if found">
     Check for and apply updates
   </message>
   <message name="IDS_UPGRADE_OFFLINE" desc="Status label: Currently offline">
     You are currently offline.
   </message>
   <message name="IDS_UPGRADE_DISALLOWED" desc="Status label: Upgrade disallowed for the current network">
     You are currently connected to the <ph name="NETWORK_TYPE">$1<ex>cellular</ex></ph> network.
@@ skipping 661 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>