Fix 4 errors of the fleet page in OGAME version 8.0.0-pl7:

• Eliminate unnecessary routines that slow down the fleet page by asking the server for data that is already available.
• Eliminate an unnecessary delay of 500ms in Fleet2
• Fleet3 now no longer gets stuck if 'enter' is pressed before selecting mission
• Now the standard fleet edition can be reopened without the need to reload the page.