Twitter has announced that they will be rolling out support for more language. First in the cue is French, Spanish, German, and Italian. More are planned for later.
"Twitter is currently available only in English and Japanese. With some help, we will soon be rolling out support for French, Italian, German, and Spanish. These languages are commonly referred to using the acronym FIGS and are often the starting point for services like Twitter when its time for more language support. Later, we hope to offer Twitter in several other languages."