title: Shiny - Change "Upload complete" and "... files" text in fileInput
body: <p>As soon as multiple files (say, 6) are uploaded via fileInput, I receive the text "6 files" next to the button, and "Upload complete" in the progress bar. Also, I suppose some text is provided in progress bar in case of emergency (faulty upload or smth.). UI of the app I am writing is in Russian, so all the labels are to be in Russian. According to documentation, I can set just buttonLabel and placeholder labels in fileInput, nothing about the text I mentioned above. Any ideas how can I change it? </p>