Fixed The "Mark as Sold" form doesn't like special unicode characters in player names

Device: PC
Browser: Chrome
OS: Win10

I marked a traded item as sold but the webpage didn't like the "ü" in the name of the player who bought my stuff.
When I started entering his name the dropdown list appeared and I selected his name that had an "invalid unicode chararacter / question mark" in place of the "ü".
After completing the form the "sold to" part doesn't show his name: trade/angelic-raiment-t236687.html

Just type it in without clicking anything from the drop down and then mark as sold (in the future).