update descriptor.mod

Only update to 3.4 for delete the warning of outdate (3.3).

Update to 3.3 version.

Now the decision cost is 1500 of unity instead 150 of influence.

• Now, only by decision.
  
• Reduced cost from 175 of influence to 150.
  
• Reduced time from 10 years to 5 years for do the decision
  
• Translated to Polish (by Wiciador_Wolf)

• descriptor file updated to 3.2 Stellaris Version
  

AI was not picking up agenda - Fixed!
English decision title Ruler Agenda changed to Ruler's Agenda