How about using some regular expressions
var fi,se,en;
var description =
"<p>\
FI: Sähköpyörä, Tunturi<br />\
SE: Elektrisk Cykel, Tunturi<br />\
EN: Electric Bike, Tunturi<br />\
</p>";
var match = description.match(/FI:\s*(.+)<br \/>\s*SE:\s*(.+)<br \/>\s*EN:\s*(.+)<br \/>/);
fi = match[1];
se = match[2];
en = match[3];