Show current users latest bid

This merge request makes current users latest bid on item visible if he/she has made one.

1. Go check an item you have not bid on, that you can't see any amount next to "Your bid" / "Sinun tarjouksesi" text.
2. Go check an item you have bid on, that you can see the amount you bid.
3. Check that no error occurs on viewing item if you are not logged in.