function translateY( scale ) {
	return translateY;

	/**
	* Vertically translates a tick.
	*
	* @private
	* @param {*} d - datum
	* @returns {string} transform
	*/
	function translateY( d ) {
		var t = 'translate(0,'+scale( d )+')';
		debug( 'Value: %s => Transform: %s.', d, t );
		return t;
	}
}
Returns a function to vertically translate a tick.

@private
@param {Function} scale - scale function
@returns {Function} function to translate a tick