nodes: slightly improve descriptions

app/node/color/displaytransform/displaytransform.cpp

@@ -56,7 +56,7 @@ QVector<Node::CategoryID> DisplayTransformNode::Category() const
 
 QString DisplayTransformNode::Description() const
 {
-  return tr("Converts an image to/from display space");
+  return tr("Converts an image to or from a display color space.");
 }
 
 void DisplayTransformNode::Retranslate()

app/node/color/ociogradingtransformlinear/ociogradingtransformlinear.cpp

@@ -77,7 +77,7 @@ QVector<Node::CategoryID> OCIOGradingTransformLinearNode::Category() const
 
 QString OCIOGradingTransformLinearNode::Description() const
 {
-  return tr("Simple linearcolor grading using OCIO");
+  return tr("Simple linear color grading using OpenColorIO.");
 }
 
 void OCIOGradingTransformLinearNode::Retranslate()