Fix lupdate issues

Some wrong tr calls / missing tr functions.
Some places where we need to bring lupdate to the right track with
regard to namespace resolution.

Change-Id: Idf552054a34e24d9671db68c816bf37f4d403dbc
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cppeditor/cppquickfixes.cpp

@@ -8530,7 +8530,7 @@ public:
         if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
             switch (section) {
             case 0:
-                return tr("Base Class Constructors");
+                return CppQuickFixFactory::tr("Base Class Constructors");
             }
         }
         return {};