Replace the "?" with a flag for servers that dont reveal their nationality

[Pizza90]

The title says everything at the moment if you decide to hide your nationality no flag is shown in the lobby page, instead there is a "?" which looks ugly and make you think that a flag didnt load. I think we should have a black flag with a  white "?" or we could use the flag with the globe that flagfox (a firefox extension) uses when the server are located in an unknown place (i think the flag is in public domain since the other flags they use are in public domain i think).

[tomreyn]

Please provide the flag image discussed in the same format as the currently used images (PNG image data, 16 x 11, 8-bit/color RGB, non-interlaced) as a downloadable file as well as a licensing statement which will allow for it to be used in MegaGlest. Alternatively, please provide a download and license link for the other flag you have in mind. Thanks.