In our application, users are able to specify what language they want to see text in the UI in. To that end, I'm trying to set the tooltip text on amChart's zoom out button to the appropriate language string. However, it's not working. In the code where we configure the zoom out button, I've added the following line:

chart.zoomOutButton.tooltipText = zoomOutText;

where zoomOutText is set to the appropriate text for this tooltip in the user's chosen language. However (and chart is the xyChart that contains the zoom out button), when I select a non-English language and go to a page with the chart, the tooltip remains defiantly in English.

How can I get this override to work? (Or is it even possible?)