Bug 56863 - make about:plugins localizable, r=biesi, sr=bz

suite/locales/en-US/chrome/common/region.properties

@@ -9,3 +9,8 @@ intl.content.langcode=en-US
 # update notifications: new update page
 update_notifications.provider.0.datasource=
 
+# plug-ins URLs
+more_plugins_label = Netscape.com
+more_plugins_url = http://home.netscape.com/plugins/index.html
+plugindoc_label = plugindoc.mozdev.org
+plugindoc_url = http://plugindoc.mozdev.org/