A Sinatra extension that provides i18n support to translate your
web application. It is just a wrapper for R18n core library. It has
nice Ruby-style syntax, filters, flexible locales, custom loaders,
translation support for any classes, time and number localization,
several user language support, agnostic core package with out-of-box
support for Rails, Sinatra and desktop applications.

WWW: https://github.com/ai/r18n/tree/master/sinatra-r18n