Add a Certificate Viewer link to the Page Info dropdown

components/page_info_strings.grdp

Index: components/page_info_strings.grdp
diff --git a/components/page_info_strings.grdp b/components/page_info_strings.grdp
index f90b393d1c5d3f7d7708a4f02bb8e3fd710e6c24..959ab57f584e5b4387aa273723092c7e2df7cafe 100644
--- a/components/page_info_strings.grdp
+++ b/components/page_info_strings.grdp
@@ -1,5 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
+
+  <!-- Certificate Viewer link -->
+  <message name="IDS_PAGE_INFO_CERTIFICATE" desc="Title of the certificate area in the Page Information Window, shown when a HTTPS site is loaded.">
+    Certificate
+  </message>
+  <message name="IDS_PAGE_INFO_CERTIFICATE_VALID_LINK" desc="Text of the link that launches the Certificate Viewer. This appears in the Page Information Window when a HTTPS site is loaded with a valid certificate.">
+    Valid
+  </message>
+  <message name="IDS_PAGE_INFO_CERTIFICATE_INVALID_LINK" desc="Text of the link that launches the Certificate Viewer. This appears in the Page Information Window when a HTTPS site is loaded with an invalid certificate, e.g. https://wrong.host.badssl.com/.">
+    Invalid
+  </message>
+  <message name="IDS_PAGE_INFO_CERTIFICATE_VALID_LINK_TOOLTIP" desc="The text of the tooltip on IDS_PAGE_INFO_CERTIFICATE_VALID_LINK">
+    Issued by <ph name="ISSUER">$1<ex>Let's Encrypt X3</ex></ph>.
+  </message>
+
   <!-- Summary strings -->
   <message name="IDS_PAGEINFO_SECURE_SUMMARY" desc="A short summary phrase at the top of the Page Info bubble (which shows when you click the lock icon) that indicates that the connection to the current website is secure.">
     Secure connection