Affects Version/s: Minecraft 1.9.2
Fix Version/s: Minecraft 16w43a
Lenovo Y50-70 UHD (2015), Nvidia GTX 860m 4GB, 16G ram, i7-4710HQ
Pretty much straightforward, clicking the Cancel button isn't doing anything regardless of the language of the game being used.
Pressing Esc will bring the user back to the title screen.