Contents
The dictionary name usually is something like GermanDict (some word ending with Dict). This default pattern can be changed (e.g. for non-english languages etc.), see page_dict_regex on HelpOnConfiguration.
The dict members are key/value pairs (both unicode strings).
You can create a dict definition for a dict named GermanDict by creating a page called GermanDict with this content:
#format wiki This translates some words from English to German: dog:: Hund cat:: Katze mouse: Maus
Important:
Dict members have to be on a first-level definition list (see HelpOnLists).
The leading space and the space after '::' are important.
MoinMoin uses <Language>Dict additionally to the builtin gettext based translations. E.g. if it wants to translate cat to German and doesn't find it in the .po file, it will try to look it up on GermanDict (and find Katze there, see the example above).
See also HelpOnVariables.
You can use ACLs as usual to protect your dict pages.
MoinMoin can also use dict definitions from other sources, but this needs to be configured in your wiki config. See dicts on HelpOnConfiguration.