I think I found something. In the 'Interface' settings page there's a rich text box for 'description' for the primary point on the map. I entered the following:
Hotel La Clef des Champs
Neuch'Evasion
This reappeared in the page source as follows:
function mapReadFailure415(result,ctx) { DATA415=result; Map_FetchEnd(415);}
var SHOWTIMER415 = false;
...
var CZOOM415 = 4;
var XZOOM415 = 4;
var DDESC415 = '<p>Hotel La Clef des Champs<br />
\nNeuch\'Evasion</p>';
var DZOOM415 = 4;
var DICON415 = 0;
etc. As you can see the output JS is erroneous. First the linebreak was transmitted and secondly the apostrophe. It looks like the DDESC needs to be encoded to make it through. I removed the linebreak and apostrophe and it's working. I don't have the ability to add an entry in Gemini so you'll have to do this.
Cheers,
Peter