MD Settings: Certificate manager, polish "no certificates" text.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Policy Indicators -->
   <message name="IDS_SETTINGS_CONTROLLED_SETTING_EXTENSION" desc="Text displayed in the controlled settings indicator tooltip when a setting's value is enforced by an extension.">
     This setting is controlled by extension <ph name="NAME">$1<ex>Settings Extension</ex></ph>
   </message>
 
   <!-- Accessibility Page -->
   <message name="IDS_SETTINGS_ACCESSIBILITY" desc="Name of the settings page which displays accessibility preferences.">
@@ skipping 216 matching lines @@
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_YOUR_CERTIFICATES_DESCRIPTION" desc="Label for your certificates subtitle tab in certificate manager.">
       You have certificates from these organizations that identify you
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_SERVERS" desc="Label for the servers tab in certificate manager.">
       Servers
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_SERVERS_DESCRIPTION" desc="Label for servers subtitle tab in certificate manager.">
       You have certificates on file that identify these servers
     </message>
+    <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_NO_CERTIFICATES" desc="Message displayed by the certificate manager, indicating that there are no certificates for a given certificate category.">
+      You have no certificates
+    </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_AUTHORITIES" desc="Label for the authorities tab in certificate manager.">
       Authorities
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_AUTHORITIES_DESCRIPTION" desc="Label for authorities subtitle tab in certificate manager.">
       You have certificates on file that identify these certificate authorities
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_VIEW" desc="Label for view button in certificate manager.">
       View
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_EDIT" desc="Label for the button in the certificate manager which allows you to edit certificate trust">
@@ skipping 951 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>