[Plone-i18n] LinguaPlone Flags for combined language codes

[gmf <ge...@fe...>]

How can I add a flag for a country with a combined language-code, so that it
will be shown as flag and not as country name? 
You can see the problem here on that webpage for the language-code Serbian
(Yugoslavia)  http://www.unitedgames.org http://www.unitedgames.org 
I tried to put it as flag-sr-yu.gif into the custom folder, but it doesn't
work. I tried to figure out where the flags are stored, but I can't find it.

Did someone have the same problem before? I would be very greatful to get
some help on that, I've been trying to solve that for quite some time now...
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