title: Centering multi-line Button or Label text in kivy?
body: <p>In kivy, how do you go about creating Buttons or Labels with multiple lines of text which are automatically centered? If you do something like, <code>Button(text = 'my button\nthis is my button')</code>, it seems that only one of the lines will be centered, while the other line will be off-center. Thanks.</p>