The bug fix for 4794177 "split message resources on ControlPanel cannot be localized properly" caused a regression bug in l10n because the l10n messages also need to be updated as follows:

src/plugin/src/share/classes/sun/plugin/resources/ControlPanel.java:
        { "update.advanced_desc1.text", "Perform scan every day " },
        { "update.advanced_desc2.text", "Perform scan every {0} " },
        { "update.advanced_desc3.text", "Perform scan on day {0} of every month " },
        { "update.advanced_at.text", "at {0}" },

These message resources should be:
        { "update.advanced_desc1.text", "Perform scan every day at {0}" },
        { "update.advanced_desc2.text", "Perform scan every {1} at {0}" },
        { "update.advanced_desc3.text", "Perform scan on day {1} of every month at {0}" },