Selenium Webdriver - set preferred browser language DE

Question

I have a problem setting the preferred (accepted language) within headless Chrome using Selenium Webdriver and Ruby. I use the following WebDriver settings:

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Answer 1

You should be able to solve your problem by adding an experimental option:

options.add_option('prefs', {'intl.accept_languages': 'en,en_US'})

I'm sure it works with Python, but I've not tried with Ruby: this approach is the correct one, not sure about the implementation.
You can find in this repository the code which handles your problem in Python code, and in this Q&A how to implement experimental_options in Ruby