chrome_language
Starting with Google Chrome developer channel release 4.0.288.1 and beta channel release 4.0.249.64 for Windows, an internationalization (i18n) framework for Google Chrome Extensions is available and enabled by default.
This will help developers to use different languages for their extensions. To localize the extension manifest, extract all user-visible strings into message catalogs, and define the default locale.
Are you a developer  ? For instructions on how to do this, and for more details, see the documentation.