[MAP] Empire should give a hint

[Langbart]

A user named Bablu reported an issue with the Empire map via IRC 0ad ​12/Mar/22. The player starts with 2 CC on this particular map, but there is no warning/notice for this unusual setting during the game setup.

[18:20:36] Langbart we should add a RED message to it.
[18:20:40] Langbart what do u think?
[18:21:24] Bablu yes some way you should let the player know before the game starts. or you can tell it to your website
[18:21:51] Bablu i was searching for it through the whole month

[Freagarach]

Not necessarily a red message, but more obvious than currently stated in the description might be nice.

[Stan]

In 26639:

Add a word of caution to the empire map.
Patch by: @Langbart
Fixes #6456
Differential Revision: ​https://code.wildfiregames.com/D4546