From the string translation page, you should select the "wp-cred" as the domain from "All Domain" dropdown and search for the string "Upload or select file" and then translate into all your required languages.
The same steps apply to search the string "Not Set".
Hi Minseh,
The client has no budget for the WPML plug-in license in this project. I need the PHP code to translate these items. Also is there an easy way for me to find out what the code is myself in the future, as I may encounter other items on the website related to Toolset that need translating?