Robert Basic has put together a new post to his blog about a hack he's found for the Zend Framework translated route segments when a "gotcha" popped up when he was trying to use them in a multi-language website.
The web site’s default locale, language, is English. If the user has no locale in the session/cookie, she, or he, will get the English version of the web site. [...] But! If the user’s first visit is on the http://example.com/vesti URL ("vesti" is "news" in Serbian), the router can’t route that because it depends on the locale and the default locale is English and not Serbian, thus directing the user to the 404 page.
To get around this issue he created a front controller plugin that fires in the postDispatch hook to change the locale manually if the current request's isn't found to be English. It then redirects the user to the correct location for the new language and things proceed normally.