{

    "DATA_SOURCE_RADIUS" : {
        "NAME" : "RADIUS Backend"
    },

    "LOGIN" : {
        "FIELD_HEADER_GUAC_RADIUS_STATE"              : ""
    }

}

{

    "DATA_SOURCE_RADIUS" : {
        "NAME" : "RADIUS Backend"
    },

    "LOGIN" : {
        "FIELD_HEADER_GUAC_RADIUS_STATE"              : "",
        "FIELD_HEADER_RADIUSCHALLENGE"                : ""
    }

}

Add back empty translation string.
GUACAMOLE-769: Add back empty translation string.
