Multi line dialog box in Mapping.en-US.json.js file

Hi, I am trying to modify the text of a particular dialog box in the Mapping.en-US.json.js file. I can change the text fine, but I am trying to display the message on multiple lines. I have added \r\n to the line and it seems to recognize it, but the message still appears on one line. Has anyone else experienced this or have a solution? Thanks.