Documentation missing for fileInput()

Yii doc states that fileInput() method accepts an array of options, but it doesn’t say what those options are or links to where they are defined. See it here:

For example I know that one option is "accept’, though this is not listed there.

What I need to find out is which option allows me to change the label of button (“Choose file”) or the hint text that appears on the right side of the button (“No file chosen”) so that I can provide i18n support for them in my app.

Have a look here