Proper alliance timer naming (#886)

## Description:
Now it's just Time Remaining, the remaining time for what is unknown.

Alliance Expires In
Timer

Would be better
## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:
dovg

resources/lang/en.json

@@ -406,7 +406,7 @@
     "troops": "Troops",
     "betrayals": "Number of betrayals",
     "traitor": "Traitor",
-    "alliance_time_remaining": "Time Remaining",
+    "alliance_time_remaining": "Alliance Expires In",
     "embargo": "Stopped trading with you",
     "nuke": "Nukes sent by them to you",
     "start_trade": "Start trading",