Gets the alignment of text within a container.
Possible values are:left, right, or center.
The default value for most components is left. For the FormItem component, the default value is right. For the Button, LinkButton, and AccordionHeader components, the default value is center, and this property is only recognized when the labelPlacement property is set to left or right. If labelPlacement is set to top or bottom, the text and any icon are centered.