Probably http://www.google.com/support/chrome/bin/answer.py?answer=95416 will help?
Quoting the related stuff:
- Click the wrench icon on the browser toolbar.
- Select Options (Preferences on Mac and Linux).
- Click the Under the Hood tab and go to the "Web Content" section. Here are the various settings you can adjust:
Browser interface language
The browser interface language is used for browser menus and dialogs
and it's based on the language you selected when you first downloaded
Google Chrome.
In Windows, follow these steps to change this setting:
- Click Languages and spell-checker settings to open the "Language and Input" dialog.
- Select the language you'd like to use from the list. If the language isn't listed, first add it as one of your preferred webpage languages.
- On the right panel, click Display Google Chrome in this language.
- Restart the browser to apply the changes.
On a Mac, currently the browser interface language is determined by
the Language & Text setting in System Preferences. To learn how to
update your system language, visit Apple Computer’s Support .
On a Linux, check your system language support.