Try creating the file ~/.gtkrc with the following content
style "user-font"
{
font="-greek-helvetica-medium-r-normal-*-*-120-*-*-p-*-iso8859-7"
}
widget_class "*" style "user-font"
style "grfont"
{
font =
"-greek-helvetica-medium-r-normal--*-120-*-*-*-*-iso8859-7"
}
widget_class "*" style "grfont"
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