Headerbar improvements to fit HIG

data/interface.ui

@@ -31,9 +31,10 @@
   </menu>
   <template class="RugbyAppWindow" parent="GtkApplicationWindow">
     <property name="title" translatable="yes">Rugby</property>
+    <property name="default-height">600</property>
+    <property name="default-width">400</property>
     <child>
       <object class="GtkScrolledWindow">
-        <property name="height_request">600</property>
         <child>
           <object class="GtkListView" id="listview">
             <property name="model">
@@ -55,15 +56,19 @@
     </child>
     <child type="titlebar">
       <object class="GtkHeaderBar">
-        <child>
-          <object class="GtkLabel">
-            <property name="label" translatable="yes">Score:</property>
-          </object>
-        </child>
         <child>
           <object class="GtkSpinButton" id="scorespin">
             <property name="adjustment">adjustment1</property>
             <property name="focusable">1</property>
+            <property name="tooltip-text">Score</property>
+          </object>
+        </child>
+        <child type="title">
+          <object class="GtkLabel">
+            <property name="label">Rugby</property>
+            <style>
+              <class name="title"/>
+            </style>
           </object>
         </child>
         <child type="end">