Improve i18n descriptions based on clarifications requested.

BUG=NONE

Review-Url: https://codereview.chromium.org/2195003002
Cr-Commit-Position: refs/heads/master@{#408755}

chrome/app/settings_chromium_strings.grdp

@@ -29,7 +29,7 @@
   </if>
 
   <!-- Autofill Page -->
-  <message name="IDS_SETTINGS_GOOGLE_PAYMENTS_CACHED" desc="Label that will be used to show that a credit card comes from Google Payments and is saved locally. This should follow the casing of the 'Google Payments' and 'Chrome' brands.">
+  <message name="IDS_SETTINGS_GOOGLE_PAYMENTS_CACHED" desc="Label that will be used to show that a credit card comes from Google Payments and is saved locally. This should follow the casing of the 'Google Payments' and 'Chrome' brands. 'Copied to Chromium' is short for 'The credit card is copied to Chromium'">
     Google Payments (copied to Chromium)
   </message>
 

chrome/app/settings_google_chrome_strings.grdp

@@ -29,7 +29,7 @@
   </if>
 
   <!-- Autofill Page -->
-  <message name="IDS_SETTINGS_GOOGLE_PAYMENTS_CACHED" desc="Label that will be used to show that a credit card comes from Google Payments and is saved locally. This should follow the casing of the 'Google Payments' and 'Chrome' brands.">
+  <message name="IDS_SETTINGS_GOOGLE_PAYMENTS_CACHED" desc="Label that will be used to show that a credit card comes from Google Payments and is saved locally. This should follow the casing of the 'Google Payments' and 'Chrome' brands. 'Copied to Chrome' is short for 'The credit card is copied to Chrome'">
     Google Payments (copied to Chrome)
   </message>
 

chrome/app/settings_strings.grdp

@@ -355,7 +355,7 @@
   </message>
   <if expr="is_macosx">
     <then>
-      <message name="IDS_SETTINGS_PASSWORDS_MANAGE_PASSWORDS" desc="Shown in the passwords section of settings. Descriptive text to inform that passwords can be accessed online. Has a link. Also notifies mac users that chrome will sync passwords to the OS's Keychain, so their passwords will be synced to other chrome profiles.">
+      <message name="IDS_SETTINGS_PASSWORDS_MANAGE_PASSWORDS" desc="Shown in the passwords section of settings. Descriptive text to inform that passwords can be accessed online. Has a link. Also notifies mac users that chrome will sync passwords to the OS's Keychain, so their passwords will be synced to other chrome profiles. 'Keychain' is the name of a program on Mac and should not be translated.">
         Access your passwords from any device at <ph name="BEGIN_LINK">&lt;a is="action-link" href="$1" target="_blank"&gt;</ph>passwords.google.com<ph name="END_LINK">&lt;/a&gt;</ph>. On Mac, passwords may be saved to your Keychain and accessed or synced by other Chrome users sharing this OS X account.
       </message>
     </then>