Launcher: nicer back button.

Avoid localisation issues for the back button, by switching to an 
icon.

src/GUI/qml/AddonsDetailsView.qml

@@ -173,11 +173,9 @@ Rectangle {
                     text: " "
                 }
 
-                Button
+                BackButton
                 {
-                    width: Style.strutSize
                     id: backButton
-                    text: "< Back"
                     onClicked: root.goBack();
                 }
 

src/GUI/qml/AircraftDetailsView.qml

@@ -38,9 +38,14 @@ Rectangle {
                 spacing: Style.margin
                 anchors.horizontalCenter: parent.horizontalCenter
 
+                Item { // top padding
+                    width: parent.width
+                    height: Style.margin
+                }
+
                 AircraftVariantChoice {
                     id: headingBox
-                    fontPixelSize: 30
+                    fontPixelSize: Style.headingFontPixelSize * 2
                     popupFontPixelSize: Style.headingFontPixelSize
 
                     anchors {

src/GUI/qml/AircraftList.qml

@@ -352,11 +352,9 @@ FocusScope
         anchors.fill: parent
         visible: false
 
-        Button {
+        BackButton {
-            anchors { left: parent.left; top: parent.top; margins: Style.margin }
-            width: Style.strutSize
             id: backButton
-            text: "< Back"
+            anchors { left: parent.left; top: parent.top; margins: Style.margin }
             onClicked: root.goBack();
         }
     }

src/GUI/qml/BackButton.qml

@@ -0,0 +1,27 @@
+import QtQuick 2.4
+import "."
+
+Item {
+    id: root
+    signal clicked
+    property bool enabled: true
+
+    width: image.width + Style.margin
+    height: image.height + Style.margin
+
+    Image {
+        id: image
+        anchors.centerIn: parent
+        source: "qrc:///back-icon"
+    }
+
+    MouseArea {
+        id: mouse
+        hoverEnabled: true
+        anchors.fill: parent
+
+        onClicked: {
+            root.clicked();
+        }
+    }
+}

src/GUI/qml/FlightPlan.qml

@@ -481,12 +481,10 @@ Item {
         }
     }
 
-    Button {
+    BackButton {
         id: backButton
         anchors { left: parent.left; top: parent.top; margins: Style.margin }
-        width: Style.strutSize
         visible: detailLoader.visible
-        text: "< Back"
         onClicked: {
             detailLoader.sourceComponent = null
         }

src/GUI/qml/Location.qml

@@ -323,13 +323,10 @@ Item {
         }
     }
 
-    Button {
+    BackButton {
         id: backButton
-
         anchors { left: parent.left; top: parent.top; margins: Style.margin }
-        width: Style.strutSize
         visible: detailLoader.visible
-        text: qsTr("< Back")
         onClicked: root.backToSearch();
     }
 }

src/GUI/resources.qrc

@@ -29,6 +29,7 @@
         <file alias="toolbox-summary">assets/toolbox-summary.png</file>
         <file alias="toolbox-addons">assets/toolbox-addons.png</file>
         <file alias="toolbox-help">assets/toolbox-help.png</file>
+        <file alias="back-icon">assets/icons8-back-arrow-50.png</file>
         <file>qml/AircraftList.qml</file>
         <file>qml/AircraftRating.qml</file>
         <file>qml/ArrowButton.qml</file>
@@ -141,7 +142,7 @@
         <file>qml/NewVersionNotification.qml</file>
         <file>qml/DidMigrateOfficialCatalogNotification.qml</file>
         <file>qml/DidMigrateOtherCatalogNotification.qml</file>
-
+        <file>qml/BackButton.qml</file>
     </qresource>
     <qresource prefix="/preview">
         <file alias="close-icon">assets/preview-close.png</file>