Tweak some UI Yaml files

- Increase space of some elements to fit their text.
- Remove editor text that aren't translation keys. The text will be set in code anyway.
- Remove some unused elements.
- Provide a translation key for the port separator, to avoid log warnings.

mods/common/chrome/multiplayer-directconnect.yaml

@@ -32,7 +32,7 @@ Background@DIRECTCONNECT_PANEL:
 			Width: 10
 			Height: 25
 			Align: Center
-			Text: :
+			Text: label-directconnect-panel-port
 		TextField@PORT:
 			X: 370
 			Y: 60