Replace estimates numeric to TShirt sizes (actual script http://tm.fedot.name/pivotal-tshirt.user.js)

pivotal-tshirt.user.js

// ==UserScript==
// @name         T-Shirt estimates
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Changed estimates to t-shirts
// @author       Fedot
// @match        https://www.pivotaltracker.com/n/projects/*
// @grant        none
// @updateUrl    http://tm.fedot.name/pivotal-tshirt.user.js
// ==/UserScript==

function makeTShirtsForDropdownItems(estimateDropDownItems) {
    for (var i = 0; i < estimateDropDownItems.length; i++) {
        var originVal = estimateDropDownItems[i].innerHTML;
        switch (originVal) {
            case '1 point':
                estimateDropDownItems[i].innerHTML = 'XS size';
                break;
            case '2 points':
                estimateDropDownItems[i].innerHTML = 'S size';
                break;
            case '4 points':
                estimateDropDownItems[i].innerHTML = 'M size';
                break;
            case '8 points':
                estimateDropDownItems[i].innerHTML = 'L size';
                break;
            case '16 points':
                estimateDropDownItems[i].innerHTML = 'XL size';
                break;
        }
    }
}

var makeTShitForNode = function (node) {
    var estimates;
    estimates = node.querySelectorAll('span.estimate > label > div');
    makeTShirts(estimates);

    estimates = node.querySelectorAll('span.meta > span');
    makeTShirts(estimates);

    var estimateDropDownItems = node
            .querySelectorAll('.story_estimate div.dropdown_menu > ul > li.dropdown_item .dropdown_label, .story_estimate > a.selection > span');
    makeTShirtsForDropdownItems(estimateDropDownItems);
};

function makeTShirts(estimates) {
    for (var i = 0; i < estimates.length; i++) {
        var numericVal = estimates[i].innerHTML;
        switch (numericVal) {
            case '1':
                estimates[i].innerHTML = 'XS';
                break;
            case '2':
                estimates[i].innerHTML = 'S';
                break;
            case '4':
                estimates[i].innerHTML = 'M';
                break;
            case '8':
                estimates[i].innerHTML = 'L';
                break;
            case '16':
                estimates[i].innerHTML = 'XL';
                break;
        }
    }
}

function trackChangeStories(node) {
    console.log('start track stories');
    var observer = new MutationObserver(
        function (mutations) {
            mutations.forEach(function (mutation) {
                if (mutation.addedNodes) {
                    for (var i = 0; i < mutation.addedNodes.length; i++) {
                        var node = mutation.addedNodes[i];
                        if (
                            node.nodeName != 'DIV'
                            || node.classList === undefined
                            || !node.classList.contains('story')
                        ) {
                            continue;
                        }

                        makeTShitForNode(node);

                        return;
                    }
                }

                if (
                    mutation.target.nodeName == 'HEADER'
                    && mutation.target.classList.contains('preview')
                ) {
                    makeTShitForNode(mutation.target);
                }

                if (
                    mutation.target.firstChild
                    && mutation.target.firstChild.nodeName == 'DIV'
                    && mutation.target.firstChild.classList.contains('edit')
                    && mutation.target.firstChild.classList.contains('details')
                    && mutation.addedNodes.length
                ) {
                    makeTShitForNode(mutation.target);
                }

                if (
                    mutation.target.nodeName == 'DIV'
                    && mutation.target.classList.contains('info')
                ) {
                    makeTShitForNode(mutation.target);
                }
            });
        }
    );

    observer.observe(node, {
        childList: true,
        subtree: true,
        attributes: false,
        characterData: false
    });
}

var waitProjectsDom = function () {
    var observer = new MutationObserver(
        function (mutations) {
            mutations.forEach(function (mutation) {
                if (!mutation.addedNodes) {
                    return;
                }

                for (var i = 0; i < mutation.addedNodes.length; i++) {
                    var node = mutation.addedNodes[i];
                    if (
                        node.nodeName != 'DIV'
                        || node.classList === undefined
                        || !node.classList.contains('table')
                    ) {
                        continue;
                    }

                    makeTShitForNode(node);
                    trackChangeStories(node);
                    observer.disconnect();

                    return;
                }
            });
        }
    );

    observer.observe(document.body, {
        childList: true,
        subtree: true,
        attributes: false,
        characterData: false
    });
};
(function() {
    'use strict';

    waitProjectsDom();
})();