Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt."
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.

Translations:Life Preserver/9.2/7/en

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To remove the icon from the system tray, right-click it. To re-add it to the tray, go to Control Panel → Life Preserver or type pc-su life-preserver & at the command line. If your desktop manager does not provide a system tray, you will need to instead manage backups from the command line.

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