You can change the language of your search engine interface (for example, the Search button and other elements) at any time. This affects only the user interface; it doesn't affect the results returned by your search engine.
Change the language of an existing search engine:
- On the Custom Search home page, click the search engine you want.
- Click Setup, and then click the Basics tab.
- In the Language section, click the option you want.
Note: You can include sites of any language in your search engine, regardless of what language your interface is in.