Settings: Update translation strings that needed clarifying.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <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
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_ARC_VERSION" desc="Label for ARC version">
       ARC Version
@@ skipping 1384 matching lines @@
     </message>
     <message name="IDS_SETTINGS_CHANGE_PICTURE_PREVIEW_ALT" desc="Alt text for the big preview of user image.">
       User image preview
     </message>
     <message name="IDS_SETTINGS_CHANGE_PICTURE_AUTHOR_TEXT" desc="Author label.">
       Photo by
     </message>
     <message name="IDS_SETTINGS_CHANGE_PICTURE_PROFILE_LOADING_PHOTO" desc="The text on the loading stub for Google profile image.">
       Google Profile photo (loading)
     </message>
-    <message name="IDS_SETTINGS_CHANGE_PICTURE_OLD_PHOTO" desc="The text on the existing photo from camera or file.">
+    <message name="IDS_SETTINGS_CHANGE_PICTURE_OLD_PHOTO" desc="The text on the existing photo, which was either taken by the webcam or read from a file.">
       Existing photo from camera or file
     </message>
   </if>
 
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_PEOPLE_DOMAIN_MANAGED_PROFILE" desc="Provides the domain information for domain-managed accounts.">
       Managed by <ph name="DOMAIN">$1<ex>example.com</ex></ph>
     </message>
     <message name="IDS_SETTINGS_SYNC_DISCONNECT_MANAGED_PROFILE_EXPLANATION" desc="The text to display in the 'Sign out of Chrome' dialog to stop syncing for managed profiles.">
       Because this account is managed by <ph name="DOMAIN">$1<ex>example.com</ex></ph>, your bookmarks, history, passwords, and other settings will be cleared from this device. However, your data will remain stored in your Google Account.
     </message>
-    <message name="IDS_SETTINGS_EDIT_PERSON" desc="Title of the edit person subpage">
+    <message name="IDS_SETTINGS_EDIT_PERSON" desc="Title of the edit person subpage. This is a subpage to edit the name and icon of a Chrome Profile.">
       Edit person
     </message>
   </if>
 
   <message name="IDS_SETTINGS_SYNC_OVERVIEW" desc="The message that appears in the options dialog when sync has not been set up by the user.">
     Sign in to get your bookmarks, history, passwords and other settings on all your devices. You'll also automatically be signed in to your Google services.
   </message>
   <message name="IDS_SETTINGS_SYNC_DISCONNECT" desc="The text to display on the button to indicate stop syncing functionality.">
     Sign Out
   </message>
@@ skipping 371 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>