Replace FA icon with generic unicode symbol for cross browser compatibility
Replace FA icon with generic unicode symbol for cross browser compatibility

Closes: #1604

simplesamlphp/simplesamlphp,ghalse/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,simplesamlphp/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,dnmvisser/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,ghalse/simplesamlphp