Sometimes, you may want to add query arguments to your IFrames. This is especially useful if you want to, for example, add something like hl=fr to the URL. This may help render the Google Form in fr (French).
Within Advanced Settings, we allow you to add query arguments. For example, if your url is www.website.com and you want to render www.website.com?key1=val1&key2=val2, you can enter key=1val1&key2=val2 in the Query Arguments field. The final IFrame will then be rendered as www.website.com?key1=val1&key2=val2..
If you are specifically looking to render your entire form in English, add hl=en to the Query Arguments field.