Button Template
--- if is child of button-group ---
{f:if(condition: '{data.tx_t3sbootstrap_header_fontawesome}', then: ' ')}
{data.header -> f:format.raw()}
--- default button ---
{f:if(condition: '{data.tx_t3sbootstrap_header_fontawesome}', then: ' ')}
{data.header -> f:format.raw()}