Tell us what you are trying to do?
I've scanned for the strings "select your file" and "no file selected" in Theme and plugins localization. I've also searched in String translation. No such strings found.
I couldn't access the WordPress admin dashboard because it takes me to another login form from "WP staging". When I use the same details, it shows "Access denied".
Please provide the login details of WP staging, I've enabled the private reply.
The string "No file selected" is added and controlled by the browser, if you checked the page in different browsers you'll see that each one is using a different string. This string will be translated based on the browser language as you see here: hidden link
Since the strings are added by (Browser - CSS), they can't be translated with WPML. To fix this, you need to make sure that the strings are added with PHP and that the above conditions are met.