Game Maker Language was created in 1999.

Language is usually set by the language of the DS console itself. Otherwise, if the game has multiple language support, it usually asks each time it is started. Lastly if it has neither, then really only the game's own manual can tell you, there is no standardised 'language change' function.

No, it's determined by the version of the game. The system language sets the language for the system menus, etc.

The duration of Body Language - game show - is 1800.0 seconds.

To set the language of a German game to English, first, open the game's menu or settings option. Look for a language or Sprache option. From there, select English (Englisch) as the desired language. If you can't find the language option, you may need to consult the game's documentation or contact the game's developer or customer support for assistance.