FIXED propery name mispelling (causing extra empty line in history saving)

sdk/actions/application/OpenFile.cpp

@@ -59,7 +59,7 @@ OpenFile::OpenFile (ActionExtension* extension) : Action (extension) {
     getQAction()->setShortcutContext(Qt::ApplicationShortcut);
 
     // the unique property is the filename
-    Property* fileNameProperty = new Property(tr("File name"), "", tr("The name of the file to open."), "");
+    Property* fileNameProperty = new Property(tr("File Name"), "", tr("The name of the file to open."), "");
     addParameter(fileNameProperty);
 
     // lazy instanciation