add English comments

sources/factory/elementpicturefactory.cpp

@@ -519,6 +519,10 @@ void ElementPictureFactory::parseText(const QDomElement &dom, QPainter &painter,
 	painter.rotate(dom.attribute("rotation", "0").toDouble());
 
 	/*
+		Moves the QPainter's coordinate system to render in the right place;
+		note: the font's ascent() is subtracted to determine the top left
+		corner of the text, whereas the position indicated corresponds
+		to the baseline.
 		Deplace le systeme de coordonnees du QPainter pour effectuer le rendu au
 		bon endroit ; note : on soustrait l'ascent() de la police pour
 		determiner le coin superieur gauche du texte alors que la position

sources/qet.cpp

@@ -576,8 +576,11 @@ qreal QET::round(qreal x, qreal epsilon) {
 }
 
 /**
-	@param angle Un angle quelconque
+	@param angle Un angle quelconque / any angle in degrees
+	@param positive (bool)
 	@return l'angle passe en parametre, mais ramene entre -360.0 + 360.0 degres
+	the angle passed as a parameter, but reduced to between -360.0 +360.0 degrees
+	reduced to 0.0 .. 360.0, when bool-parameter is true
 */
 qreal QET::correctAngle(const qreal &angle, const bool &positive) {
 	// ramene l'angle demande entre -360.0 et +360.0 degres