'Add a new translation handle to the ROI. Dragging the handle will move
the entire ROI without changing its angle or shape.
Note that, by default, ROIs may be moved by dragging anywhere inside the
ROI. However, for larger ROIs it may be desirable to disable this and
instead provide one or more translation handles.
**Arguments**
pos                 (length-2 sequence) The position of the handle
relative to the shape of the ROI. A value of (0,0)
indicates the origin, whereas (1, 1) indicates the
upper-right corner, regardless of the ROI\'s size.
item                The Handle instance to add. If None, a new handle
will be created.
name                The name of this handle (optional). Handles are
identified by name when calling
getLocalHandlePositions and getSceneHandlePositions.'

def addTranslateHandle(self, pos, axes=None, item=None, name=None, index=None):

    pos = Point(pos)
    return self.addHandle({'name': name, 'type': 't', 'pos': pos, 'item': item}, index=index)
