Change wording in cost view of simulaton

The wording is a little off in the cost view of simulation. The worker cost says "1 worker" and also says "4 worker". It can either say "1 worker" or "4 Workers" or 1 FTE or 4 FTE.

Also the cost could have comma separators. "100000 $" Can be "100,000 $" or "$100,000