Clarify multi-upload text
Clarify multi-upload text

*Choose file —>  Upload one file at a time
*Upload —> Create an Audio Item
*Shorten warning text, link to multi-art item
*Move contributors above the “More fields” fold

quoideneuf/pop-up-archive,quoideneuf/pop-up-archive,quoideneuf/pop-up-archive,quoideneuf/pop-up-archive