This folder contains the pictures of the flags displayed in the language
configuration menu.

Here is how the flag is loaded in the game:

Suppose that you have selected the language 'My_language', corresponding to the
language file 'data/lang/my_language.lng'. Then the image taken for the flag
will be the image file named 'data/gfx/flag/my_language.png'.

If this file does not exists, the default flag 'data/gfx/flag/default.png' will
be used instead.

