decapitalize.user.js

// ==UserScript==
// @name          TagPro Teams Decapitalized
// @namespace     http://www.reddit.com/u/undergroundmonorail
// @include       http://tagpro-*.koalabeast.com*
// @include       http://tangent.jukejuice.com*
// @exclude       http://tagpro-*.koalabeast.com/groups/*
// @exclude       http://tangent.jukejuice.com/groups/*
// @license       WTFPL
// @author        monorail
// @version       1.1.0
// ==/UserScript==

tagpro.ready(function() {
    var prettyTextOriginal = tagpro.prettyText;
    
    tagpro.prettyText = function(e,t,n,r,s,o,u) {
        if (e.indexOf("has switched to the")>-1 | e.indexOf("has joined the")>-1 | e.indexOf("left the")>-1) {
            e=e.replace("Red team", "red team");
            e=e.replace("Blue team", "blue team");
        }
        return prettyTextOriginal(e,t,n,r,s,o,u);
    }
});