Update CBD dialog and Site Settings secondary strings in MD settings

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Main Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
       Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
     </message>
   </if>
 
@@ skipping 1595 matching lines @@
   <message name="IDS_SETTINGS_MANAGE_CERTIFICATES_DESCRIPTION" desc="Secondary, continued explanation of how to manage SSL certificates and settings in Privacy options">
     Manage HTTPS/SSL certificates and settings
   </message>
   <message name="IDS_SETTINGS_CONTENT_SETTINGS" desc="Text of the button that takes a user to settings page thats allows users to modify site settings. Also the title of that settings page.">
     Content settings
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS" desc="Text of the button that takes a user to the enhanced settings page thats allows users to modify site settings. Also the title of that settings page.">
     Site Settings
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_DESCRIPTION" desc="Secondary, continued explanation of what content settings in Chrome do">
-    Control what content websites can show you and what information they can use as you browse
+    Control what information websites can use and what content they can show you

[srahim, 2017/03/17 23:26:08]

LGTM

   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA" desc="Text for clear browsing data button in Privacy options">
     Clear browsing data
   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA_DESCRIPTION" desc="Description for clear browsing data button in Privacy options">

[srahim, 2017/03/17 23:26:08]

Add to message description: "History" refers to browsing history. "Cookies"
refers to the technical meaning of a cookie, i.e. data sent from a website and
stored on the user's computer, as in when a website saves your username or
password. 

-    Control your browsing data
+    Clear history, cookies, site data, cache…

[srahim, 2017/03/17 23:26:08]

Could we not use "cache" which isn't a very user-friendly word? Also I don't
think most users will know what "site data" is.

Some options:
A. If you want to list +2 things:
Clear history, cookies, images and files, and more

B. If you don't want to call out "images" for fear of users clearing images for
the wrong reasons:
Clear history, cookies, and more 

   </message>
   <message name="IDS_SETTINGS_TITLE_AND_COUNT" desc="The title of a section in the settings page with a count of the total number of items in the section">
     <ph name="TITLE">$1<ex>Block</ex></ph> - <ph name="COUNT">$2<ex>42</ex></ph>
   </message>
 
   <!-- Reset Settings Page -->
   <message name="IDS_SETTINGS_RESET" desc="Name of the settings page where settings may be reset.">
     Reset
   </message>
   <message name="IDS_SETTINGS_RESET_AUTOMATED_DIALOG_TITLE" desc="The title of the dialog informing the user that automated resetting of some settings occurred.">
@@ skipping 1271 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>