Edit title of more tab using editButtonTitle doesn't work

So I'm trying to rename the title of my 'More'-tab, because i'm building an App in the Dutch language. Now I'm using the editButtonTitle, but it doesn't seem to pick up the data. This is what i have, and the bar is still named 'More', while it should be 'Meer'.

var tabGroup = Titanium.UI.createTabGroup({id:'tabGroup1', editButtonTitle: 'Meer', barColor:'#336699'});