The language this text is in, as an ISO code. Pango can use this as a hint when rendering the text. If you don't understand this parameter, you probably don't need it
Iaith y testun hwn, ar ffurf cod ISO. Gall Pango ddefnyddio hyn fel awgrym wrth lunio'r testun. Os nad ydych chi'n deall y paramedr hwn, mwy na thebyg nad ydych chi ei angen