Trouble modifying the language option in selenium python bindings

I think your syntax for setting the language is off. Instead of

chrome_options.add_argument("accept-language=en-US")

Try

chrome_options.add_experimental_option('prefs', {'intl.accept_languages': 'en,en_US'})

Second Round

Looks like english isn't available in 'intl.accept_languages' yet. But after a little more searching I found the following might work--give it a try?

chrome_options.add_argument("--lang=en-US")

Third round

Try using --lang=en-GB as Fenio suggests:

chrome_options.add_argument("--lang=en-GB")

Not Working:

I've tried the --lang, but it didn't worked for me:

chrome_options.add_argument("--lang=en")
            OR
chrome_options.add_argument("--lang=en-US")

Working Solution:

After some research I found that to solve this, we have to use the experimental option intl.accept_languages:

options = webdriver.ChromeOptions()
options.add_experimental_option('prefs', {'intl.accept_languages': 'en,en_US'})
driver = webdriver.Chrome(chrome_options=options)

Note: To use above, your website should need to support the same.

There is one more way to achieve the same by translating your native language page to english:

Try using below code:

prefs = {
  "translate_whitelists": {"your native language":"en"},
  "translate":{"enabled":"True"}
}
options.add_experimental_option("prefs", prefs)