Part of 33105 fix. Adding Bad Plugin warning message labels, r=serge

xpfe/components/xfer/resources/locale/en-US/downloadProgress.properties

@@ -34,3 +34,20 @@ noDefaultPluginMessage=Netscape cannot find the Plugin Downloader Plugin.  Witho
 #
 #   Localizable URLs
 noDefaultPluginCheckboxMessage=I know I need the Plugin Downloader Plugin, but don't show me this dialog again.
+# LOCALIZATION NOTE (BadPluginTitle): 
+#
+#    This dialog is displayed when plugin throws unhandled exception
+BadPluginTitle=Illegal Operation in Plugin
+# LOCALIZATION NOTE (BadPluginMessage): 
+#
+#    This is the message for the BadPlugin dialog.
+#
+#   Localizable URLs
+BadPluginMessage=The plugin performed an illegal operation. You are strongly adviced to restart Navigator.
+# LOCALIZATION NOTE (BadPluginCheckboxMessage): 
+#
+#    This message tells the user that if they check this checkbox, they
+#    will never see this dialog again.
+#
+#   Localizable URLs
+BadPluginCheckboxMessage=Don't show this message again during this session.