Remove `No files uploaded` from translations

[ConnorYoh]

I'm not sure No files uploaded is actually used anywhere. If you've got no files uploaded, it just gives you the Upload button. It still reads okay though without so arguably doesn't matter, but it just looks like you planned to have some more text there

Originally posted by @jbrunton96 in https://github.com/Stirling-Tools/Stirling-PDF/pull/4284#discussion_r2300326014