KRACOEUS-7387:Labels on Create Proposal Screen

KRACOEUS-7387 - PD UXI M1: Labels on Create Proposal Screen
 - "to" is missing from in between the Project Dates - Done
 - "Unit Number" should be "Lead Unit" - Done
 - "Project dates" should be "Project Dates" - Done
 - "Sponsor Code" should be "Sponsor" - Done