Sorry for the inconvenience. Known Navigation header breakage.
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.
An input method is a program that allows users to enter characters and symbols not found on their input devices. For instance, an input method can allow a user to input Chinese, Japanese, Korean or Indic characters using a Latin keyboard.
PC-BSD installs the IBus framework to achieve this task. Applications are also available for SCIM, another input method framework that supports over 30 languages including Chinese, Korean, Japanese and many European languages.
Japanese ports: uim-anthy http://forums.pcbsd.org/showthread.php?t=1084&highlight=anthy+japanese