playout:SetText(text$[, length])
This function validates text and renders invalid UTF-8
with a placeholder glyph.
Note that if you have used playout:SetMarkup() or playout:SetMarkupWithAccel() on the layout before, you may want to call playout:SetAttributes() to clear the attributes set on the layout from the markup as this function does not clear attributes.
text in bytes (defaults to -1 which means length of text$)