Display changes if you can't declare war. [QoL]

[BelgiumFury]

This is a small thing that has bugged me is when the game shows you can not declare war on someone.

Let's say i want to declare war on a very big (or small) nation, from the moment i press the declare war button it will bring me to this screen:

This makes sense.
But let's say I want to declare on the leader of my alliance (grumbles in taxes), it will first let me fill in a captcha before it will take me to this screen: 

Now let's assume I want to declare war on my good friend @Kuuhaku. Now Kuuhaku is in the enemy coalition, and already full slotted. So first I will have to fill a captcha, and then after i press the war button it will take me to this screen:

Now what i propose is:
Check if you can declare war on someone from the moment you press the button for the first time.

Problem: in busy times like these you might click that button when he has slots open, and hell be full sloted by the time you did the captcha. 
Solution: Just check twice.

In most cases it would solve a lot of time without causing a lot of issues.

[Mohammad]

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