It looks like the issue is that the title attribute isn't getting removed from the locate button - perhaps due to a timing issue. It seems to work if I wait and remove the text after the locate button has loaded. Here's some sample code that shows this: 
      var homeText =  esriBundle.widgets.homeButton.home.title;
   
      var locateText =  esriBundle.widgets.locateButton.locate.title;
      geoLocate.on("load", function(){
        query('div[title ="' +  locateText + '"]').forEach(function(node){
            domAttr.remove(node, "title");
            domAttr.set(node, "data-title", locateText);
        });
      });
      home.on("load", function(){
        //Remove default tooltip for home button 
        query('div[title ="' +  homeText + '"]').forEach(function(node){
            domAttr.remove(node, "title");
            domAttr.set(node, "data-title", homeText);
        });
      });
 Thanks. How do i use this code then? Here is my full java script: var map;
var bMap = "topo";
function changeBasemap(bm) {
        bMap=bm;
      
        map.setBasemap(bMap);
         }
require(["esri/map", "esri/toolbars/navigation", 
"dojo/on", 
"dojo/parser", 
"dijit/registry", 
"dijit/Toolbar",
"dijit/form/Button",
"esri/dijit/OverviewMap", 
"esri/dijit/Scalebar", 
"esri/dijit/LocateButton",
"esri/dijit/HomeButton", 
"dojo/i18n!esri/nls/jsapi",
"dojo/query",
"dojo/dom-attr",
"dojo/domReady!"], 
function(Map, Navigation, on, parser, registry, Toolbar, Button, OverviewMap, Scalebar, LocateButton, HomeButton, esriBundle,  query, domAttr ){
      esriBundle.widgets.homeButton.home.title = "HOME"
   esriBundle.widgets.locateButton.locate.title = "FIND MY LOCATION"
   
   
    parser.parse();
    
    var navToolbar;
    
    map = new Map("map", {
        basemap: "topo",
        center: [-107.646372, 43.433484],
        zoom: 7,
        slider: "small"
    });
    
    on(map, "load", addDataLayersInit);
    on(map, "layers-add-result", initTOC);
    //on(map, "layers-add-result", initTOC_Obs);
    
    var scalebar = new Scalebar({
        map: map,
        // "dual" displays both miles and kilmometers
        // "english" is the default, which displays miles
        // use "metric" for kilometers
        scalebarUnit: "dual",
            attachTo:"bottom-right"
            
    });
    
    geoLocate = new LocateButton({
        map: map,   
    }, "LocateButton");
    geoLocate.startup();
      
      query(".zoomLocateButton").forEach(function(node){
        //remove the title attribute 
        //Get the title attribute 
        if(domAttr.get(node, "title") === esriBundle.widgets.locateButton.locate.title){
          //replace the title attribute with data-title
          domAttr.remove(node, "title");
          domAttr.set(node, "title", esriBundle.widgets.locateButton.locate.title )
        }
    });
      
      
      var home = new HomeButton({
        map: map
      }, "HomeButton");
      home.startup();
        
        query(".home").forEach(function(node){
        //remove the title attribute 
        //Get the title attribute 
        if(domAttr.get(node, "title") === esriBundle.widgets.homeButton.home.title){
          //replace the title attribute with data-title
          domAttr.remove(node, "title");
          domAttr.set(node, "data-title", esriBundle.widgets.homeButton.home.title )
        }
    });
 
      
  
    navToolbar = new Navigation(map);
    on(navToolbar, "onExtentHistoryChange", extentHistoryChangeHandler);
    
   
    
    registry.byId("zoomprev").on("click", function(){
        navToolbar.zoomToPrevExtent();
    });
    
    registry.byId("zoomnext").on("click", function(){
        navToolbar.zoomToNextExtent();
    });
  
    
    function extentHistoryChangeHandler(){
        registry.byId("zoomprev").disabled = navToolbar.isFirstExtent();
        registry.byId("zoomnext").disabled = navToolbar.isLastExtent();
        
    }
    
    var overviewMapDijit = new OverviewMap({
        map: map,
        visible: false,
            attachTo: "bottom-right",
            width: 200,
            height: 200
      
            
    });
    overviewMapDijit.startup();
    
});