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/vcsbase/submiteditorwidget.cpp

@@ -504,7 +504,7 @@ void SubmitEditorWidget::hideDescription()
     setDescriptionMandatory(false);
 }
 
-void VcsBase::SubmitEditorWidget::verifyDescription()
+void SubmitEditorWidget::verifyDescription()
 {
     auto fontColor = [](Utils::Theme::Color color) {
         return QString("<font color=\"%1\">")