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You need to add following to /etc/rc.conf:

dictd_flags="--locale zh_TW.UTF-8"

And, you also need adding the following to /usr/local/etc/dictd.conf:

database moecomp   { data "/usr/local/lib/dict/moecomp.dict.dz"
                     index "/usr/local/lib/dict/moecomp.index" }
database netterm   { data "/usr/local/lib/dict/netterm.dict.dz"
                     index "/usr/local/lib/dict/netterm.index" }
database pydict    { data "/usr/local/lib/dict/pydict.dict.dz"
                     index "/usr/local/lib/dict/pydict.index" }
database cedict    { data "/usr/local/lib/dict/cedict.dict.dz"
                     index "/usr/local/lib/dict/cedict.index" }

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