MoinMoin normally uses built-in translation (see MoinMoin/i18n/*) for translating user interface text and system page names in navi_bar.
But there is the possibility to customize navi_bar with your own stuff. Moin has no built-in translation for that usually, so what to do if you want to have them translated the same way as FrontPage usually is?
Simply create some pages like GermanDict, FrenchDict, Simplified_ChineseDict etc. (use the english name of the language) and put a definition list on them which defines the translations for the English terms, e.g. on page GermanDict:
MyProject:: MeinProjekt LatestNews:: NeuesteNachrichten
Note the space before the lines. If you do not put that space, Moin will not consider the entries as dictionnary entries. See WikiDict for details.
Moin then will use those dict pages if it can't find the text in its built-in translation dictionaries.