Many small style fixes

src/GUI/qml/AircraftRatingsPanel.qml

@@ -20,7 +20,7 @@ ListHeaderBox
             anchors.verticalCenter: parent.verticalCenter
         },
 
-        Text {
+        StyledText {
             anchors {
                 verticalCenter: parent.verticalCenter
                 leftMargin: Style.margin
@@ -72,7 +72,7 @@ ListHeaderBox
                 y: Style.margin
                 spacing: (Style.margin * 2)
 
-                Text {
+                StyledText {
                     text: qsTr("Aircraft are rated by the community based on four critiera, on a scale from " +
                                "one to five. The ratings are designed to help make an informed guess how "+
                                "complete and functional an aircraft is.")

src/GUI/qml/NoDefaultCatalogPanel.qml

@@ -18,10 +18,12 @@ Item {
 
         Row {
             y: Style.margin
+            x: Style.margin
+
             id: noDefaultCatalogRow
             spacing: Style.margin
 
-            Text {
+            StyledText {
                 text: qsTr("The official FlightGear aircraft hangar is not added, so many standard "
                       + "aircraft will not be available. You can add the  hangar now, or hide "
                       + "this message. The offical hangar can always be restored from the 'Add-Ons' page.")

src/GUI/qml/UpdateAllPanel.qml

@@ -6,7 +6,7 @@ ListHeaderBox {
     id: root
 
     contents: [
-        Text {
+        StyledText {
             id: updateAllText
             anchors {
                 left: parent.left

src/GUI/qml/YesNoPanel.qml

@@ -13,7 +13,7 @@ Rectangle {
 
     signal rejected()
 
-    Text {
+    StyledText {
         id: prompt
         anchors {
             verticalCenter: parent.verticalCenter