Use absolute locations in translation files (#288)

They provide context when using Qt Liguist, as it shows the source code where it is being used.

Also replaced QT (capital T) with Qt, as the latter is the correct name.

src/core/controller.h

@@ -72,8 +72,8 @@ private slots:
 private:
     Controller();
 
-    // replace QTimer::singleShot introduced in QT 5.4
-    // the actual target QT version is QT 5.3
+    // replace QTimer::singleShot introduced in Qt 5.4
+    // the actual target Qt version is 5.3
     void doLater(int msec, QObject *receiver, lambda func);
 
     QMap<uint, CaptureRequest> m_requestMap;