You can change the language of your search engine interface (for example, the Search box and other elements) at any time. This affects only the user interface; it doesn't affect the results returned by your search engine. To restrict the returned results to a specific language instead, add a Language restrict.
The language setting All languages is equivalent to English.
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.