Bing Language Parameter

The language parameter specifies the language for user interface strings, using either 2-letter (ISO 639-1) or 4-letter (ISO 639-1 combined with ISO 3166) codes.

Bing defaults language to English en. For instance, en-gb is used for English-United Kingdom, de is used for German.

Download the full list of supported Bing languages in JSON format:
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Typically, set this parameter to the same language as the market_code parameter, unless a different language is required for user interface strings.

Below is the whole list of valid values for the language parameter.