Sencha Touch internationalization

[couetbis]

Hi,
I want to know how can I internationalize my Sencha Touch application ?

I test to load dynamically js translation file and it's ok but my views (application is like MVC tutorial) are load before so labels aren't translate.

Example of content :

{
	ui: 'action-round',
	text: labels.accueilvue_btcommencer,
	handler: function()
	{
	     		Ext.dispatch({
	        	        controller: app.controllers.intervenant,
	        	        action: 'gotoIdentification',
	        	        animation: {type:'fade'}
	        	    });
	}
},

with labels :

labels = { 
	...    
    accueilvue_btcommencer : "Démarrer",
        ...
};

If I show an alert, label is good.

Any idea ?