Bon dia,

An official toponym does not depend on a person's point of view, precisely that makes it official. In this case, it was well stablished in the publication 'Nomenclàtor toponímic de la Catalunya del Nord' (2007) by the Institut d'Estudis Catalans and the University of Perpinyà. You can download it from here: https://publicacions.iec.cat/repository/pdf/00000044/00000018.pdf

Plus, el Bulès is also the spelling used by the Gran Enciclopèdia Catalana: https://www.enciclopedia.cat/gran-enciclopedia-catalana/el-bules

I am well aware of Joan Becat's works, which are very useful and meaningful in many aspects (historic, geographic, etc.) but they lack a proper authority control in the chosen toponymia.

I have a proficiency degree in Catalan (which is my mother tongue) and I would never change a toponym unless I was very sure it is not correctly written. Anyway, thanks for the controlling :)

Salut!