[plasmalnf] Improve wording of LnF explanation.

src/modules/plasmalnf/PlasmaLnfPage.cpp

@@ -61,7 +61,11 @@ PlasmaLnfPage::PlasmaLnfPage( QWidget* parent )
     CALAMARES_RETRANSLATE(
     {
         ui->retranslateUi( this );
-        ui->generalExplanation->setText( tr( "Please choose a look-and-feel for the KDE Plasma Desktop. You can also skip this step and configure the look-and-feel once the system is installed." ) );
+        ui->generalExplanation->setText( tr(
+            "Please choose a look-and-feel for the KDE Plasma Desktop. "
+            "You can also skip this step and configure the look-and-feel "
+            "once the system is installed. Clicking on a look-and-feel "
+            "selection will give you a live preview of that look-and-feel.") );
         updateThemeNames();
         fillUi();
     }