code: function concatenateBinaryExpression( ASTNode ) {
  	var result;
  	if ( ASTNode.operator !== '+' ) {
  		return false;
  	}
  	result = ( 'StringLiteral' === ASTNode.left.type ) ? ASTNode.left.value : concatenateBinaryExpression( ASTNode.left );
  	result += ( 'StringLiteral' === ASTNode.right.type ) ? ASTNode.right.value : concatenateBinaryExpression( ASTNode.right );
  
  	return result;
  }
docs: Long translation strings can be broken into multiple strings concatenated with the + operator.
  This function concatenates the substrings into a single string.
  @param  {object} ASTNode - the BinaryExpression object returned from the AST parser
  @return {string}          - the concatenated string