Fix lrelease version due to the default Qt5 build

As title

qm_gen.pri

@@ -5,7 +5,12 @@ isEmpty(QMAKE_LRELEASE) {
     win32|os2:QMAKE_LRELEASE = $$[QT_INSTALL_BINS]\\lrelease.exe
     else:QMAKE_LRELEASE = $$[QT_INSTALL_BINS]/lrelease
     unix {
+      equals(QT_MAJOR_VERSION, 4) {
         !exists($$QMAKE_LRELEASE) { QMAKE_LRELEASE = lrelease-qt4 }
+      } 
+      equals(QT_MAJOR_VERSION, 5) {
+        !exists($$QMAKE_LRELEASE) { QMAKE_LRELEASE = lrelease-qt5 }
+      }
     } else {
         !exists($$QMAKE_LRELEASE) { QMAKE_LRELEASE = lrelease }
     }