Decode custom video title from info

The values in JSON info are URI encoded with "+" signs, add custom decode function that decodes them.

src/misc.js

@@ -104,3 +104,8 @@ function encodeHTML(text)
         .replace(/"/g, '"')
         .replace(/'/g, ''');
 }
+
+function decodeURIPlus(uri)
+{
+    return decodeURI(uri.replace(/\+/g, ' '));
+}