W3C is working only in English? Not only … W3C is also gathering knowledge from local communities, allowing experts to contribute in their native language.
A good example for this effort is the Japanese Layout Taskforce, a joint task force between the CSS, i18n Core, SVG and XSL groups. The goal of the task force is the creation of a document about requirements for Japanese layout realized with technologies like CSS, SVG or XSL-FO. A unique feature is the working language of the task force: it is Japanese, with mailing lists and translations into English for non-Japanese participants.
This is clearly an experiment, but a good step towards crossing language and culture boundaries in (Web) standardization.