Translation not highlighted in js

[williamthome]

e.g

document.getElementById("ws_support").innerHTML = window.WebSocket?"{_ Yes _}":"{_ No _}";

{_ Yes _} and {_ No _} must be highlighted as translation.

[williamthome]

Also occurs with tags inside a string, e.g

var site_pinger = new http_ping("{% url zotonic_ping %}", 2000);

The {% is not properly highlighted.
Probably the problem is in the regex of the syntaxes files.
Needs more investigation.