add truncation to long file upload filenames; add submit button styles in ui.css
add truncation to long file upload filenames; add submit button styles in ui.css

CDLUC3/stash_engine,CDLUC3/stash_engine,CDLUC3/stash,CDLUC3/stash,CDLUC3/stash_engine,CDLUC3/stash,CDLUC3/stash_engine,CDLUC3/stash