.icon-lang-br {
    background: url(../images/country-flags/brazil.png) 
        center left/2em no-repeat !important;
}

.icon-lang-es {
    background: url(../images/country-flags/spain.png) 
        center left/2em no-repeat !important;
}

.icon-lang-en {
    background: url(../images/country-flags/united_states_of_america.png) 
        center left/2em no-repeat !important;
}

.icon-lang-de {
    background: url(../images/country-flags/germany.png) 
        center left/2em no-repeat !important;
}