statusmessages provides an easy way of handling internationalized status messages managed via an BrowserRequest adapter storing status messages in client-side cookies.
It is quite common to write status messages which should be shown to the user after some action. These messages of course should be internationalized. As these messages normally are defined in Python code, the common way to i18n-ize these in Zope is to use zope.i18n Messages. Messages are complex objects consisting of a translation domain and a default unicode text and might have an additional mapping dict and a distinct id.
The usual way to provide status messages in CMF/Plone has been to add a "?portal_status_messages=some%20text" to the URL. While this has some usability problems it also isn't possible to i18n-ize these in the common way, as the URL is currently limited to the ASCII charset, but an encoding providing support for the full unicode range is required.
The solution provided by this module is to store the status messages inside a cookie. In version 1.x a server side session like storage has been used, but this turned out not to be caching friendly for the usual web caching strategies.