Unnecessary "Leave war" button before accepting a war invitation
Overview of the bug (description):
When you get a war invitation you have three options: "Accept", "Reject" and "Leave war". The last option is unnecessary there because you can only leave a war if you were included into it. So as a result if you choose "Leave war", you also get the wrong report (leave instead of rejected).
Steps to reproduce:
1. Invite another tribe into a war
2. Check the invitation at the other tribe
3. There are three buttons: "Accept", "Reject" and "Leave war"
Reproduction rate (Every time? Sometimes?):
Every time
Browser and Version:
All browsers
Visual Reference if available (Screenshot) please put them in a spoiler.: