Although the title is already self-explanatory, I would like to explain my use case and suggest a way to integrate this functionality into Kagi Search.
Currently, when a user searches for something and requests a summary on the results page (by clicking on the three dots), the summary is presented in the same language as the user interface. In my scenario, the interface is set to English, but I would prefer to use another language for the summaries.
I believe it is a good option to give more options to the search engine user, since not everyone is a native English speaker, and it would be just a small change that will provide more choice to the user.
Regarding the interface, I imagine that this customization could be added under "Search Settings > AI," with an implementation like to the "Output Language" option of the Universal Summarizer.
The place where it could be placed on: 
The implementation on 'Universal Summarizer': 
