Re-organise main menu screen (#25173)

- The dummy control of 2px size has annoyed me for almost 5 years.
- Why is it in the top-right.
- Why is the server address not labelled.

Resources/Locale/en-US/main-menu/main-menu.ftl

@@ -2,11 +2,12 @@ main-menu-invalid-username-with-reason = Invalid username:
                                          {$invalidReason}
 main-menu-invalid-username = Invalid username
 main-menu-failed-to-connect = Failed to connect:
-                              {$reason} 
+                              {$reason}
 main-menu-username-label = Username:
 main-menu-username-text = Username
+main-menu-address-label = Server Address:
 main-menu-join-public-server-button = Join Public Server
 main-menu-join-public-server-button-tooltip = Cannot connect to public server with a debug build.
 main-menu-direct-connect-button = Direct Connect
 main-menu-options-button = Options
-main-menu-quit-button = Quit
+main-menu-quit-button = Quit