MD Settings: Migrate enable-translation toggle from non-MD settings page.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <message name="IDS_SETTINGS_ABOUT_PAGE_BROWSER_VERSION" desc="The text label describing the version of the browser, example: Version 57.0.2937.0 (Developer Build) unknown (64-bit)">
     Version <ph name="PRODUCT_VERSION">$1<ex>15.0.865.0</ex></ph> (<ph name="PRODUCT_CHANNEL">$2<ex>Developer Build</ex></ph>) <ph name="PRODUCT_MODIFIER">$3</ph> <ph name="PRODUCT_VERSION_BITS">$4</ph>
   </message>
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
@@ skipping 1440 matching lines @@
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_REMOVE" desc="Label for the menu item to remove a language from the list of enabled languages.">
     Remove
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_ADD" desc="Button under the list of enabled languages which opens a dialog that lets the user enable additional languages.">
     Add languages
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_OFFER_TO_TRANSLATE_IN_THIS_LANGUAGE" desc="The label for a checkbox which indicates whether or not pages in this language should be translated by default.">
     Offer to translate pages in this language
   </message>
+  <message name="IDS_SETTINGS_LANGUAGES_OFFER_TO_ENABLE_TRANSLATE" desc="The label of the check-box that enables the prompt to translate a page.">
+    Offer to translate pages that aren't in a language you read.
+  </message>
   <if expr="chromeos">
     <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHODS_LIST_TITLE" desc="Title for the current input method in the header for the collapsible list of enabled input methods (keyboard layouts and input method editors).">
       Input method
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHOD_ENABLED" desc="Label underneath the currently active input method in the list of enabled input methods.">
       Enabled
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHODS_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the input options (keyboard and keyboard layouts). Only visible by screen reader software.">
       Show input options
     </message>
@@ skipping 1302 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>