Change texts on submission
Update text for summary info metadata questions Add instructions for uploading files
Changes: https://docs.google.com/document/d/16Wl31NMjoTmUIBxqkWwm6yaN-fxO4u5_2fVG-M6e6Ag/edit?usp=sharing
Closes xpub/xpub#168 (closed) Closes xpub/xpub#165 (closed)