OSM History Viewer link (osmhistory.appspot.com)

// ==UserScript==
// @name           OSM History Viewer link (osmhistory.appspot.com)
// @namespace      osmhistory.appspot.com
// @description    Adds links to OSM History Viewer on OpenStreetMap relation and changeset pages.
// @include        http://www.openstreetmap.org/browse/*
// ==/UserScript==

var trans = {
    "relation" : {
        "de" : "Tateranzeige im OSM History Viewer",
        "en" : "Blame in OSM History Viewer"
    },
    "changeset" : {
        "de" : "Im OSM History Viewer anzeigen",
        "en" : "View in OSM History Viewer"
    }
};

var m = location.pathname.match(/^\/browse\/(changeset|relation)\/(\d+)/);
if(m)
{
    var type = m[1];
    var id = m[2];
    var lang = unsafeWindow.OpenLayers.Lang.getCode();

    var hvLink = document.createElement("a");
    hvLink.href = "http://osmhistory.appspot.com/" + (type == "relation" ? "blame" : "changeset") + "/" + encodeURIComponent(id);
    hvLink.appendChild(document.createTextNode(trans[type][lang] == null ? trans[type]["en"] : trans[type][lang]));

    var largerMapNext = document.getElementById(type == "relation" ? "object_larger_map" : "area_larger_map").nextSibling;
    largerMapNext.parentNode.insertBefore(document.createElement("br"), largerMapNext);
    largerMapNext.parentNode.insertBefore(hvLink, largerMapNext);
}