Bug 428579 - "You have added a security exception for this site " lacks a final dot. r=dietrich

browser/locales/en-US/chrome/browser/browser.properties

@@ -139,7 +139,7 @@ offlineApps.manageUsage=Show settings
 offlineApps.manageUsageAccessKey=S
 
 identity.identified.verifier=Verified by: %S
-identity.identified.verified_by_you=You have added a security exception for this site
+identity.identified.verified_by_you=You have added a security exception for this site.
 identity.identified.state_and_country=%S, %S
 identity.identified.title_with_country=%S (%S)