For your reference only
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.
You can include sites of any language in your search engine, regardless of what language your interface is in.
On your computer, go to the Search settings page.
On the left, click Languages.
Choose your language settings.
Which language should Google products use: This setting changes the language for the Google interface, including messages and buttons on your screen.
Currently showing search results in: This setting lets you pick more languages to see search results in. We try to automatically find results written in the language you selected above, but you can always choose more languages.
Many of the changes that occur in language begin with teens and young adults. Language changes for several reasons. First, it changes because the needs of its speakers change. New technologies, new products, and new experiences require new words to refer to them clearly and efficiently. Consider texting: originally it was called text messaging, because it allowed one person to send another text rather than voice messages by phone. As that became more common, people began using the shorter form text to refer to both the message and the process.
As young people interact with others their own age, their language grows to include words, phrases, and constructions that are different from those of the older generation.
Another reason for change is that no two people have had exactly the same language. We all know a slightly different set of words and constructions, depending on our age, job, education level, region of the country, and so on. We pick up new words from all the different people we talk with, and these combine to make something new and unlike any other person's particular way of speaking. At the same time, various groups in society use language as a way of marking their group identity.