Help viewer: Add nicer help not found message; reduce margins

Author: NathanW2

src/helpviewer/qgshelpviewer.cpp

@@ -127,6 +127,12 @@ void QgsHelpViewer::loadContext( const QString &contextId )
     // get the help content and title from the localized file
     QString helpContents;
     QFile file( fullHelpPath );
+
+    QString missingError = tr("<h3>Opps! QGIS can't find help for this form.</h3>"
+                              "The help file for %1 was not found for your language<br>"
+                              "If you would like to create it, contact the QGIS development team"
+                              ).arg( contextId );
+
     // check to see if the localized version exists
     if ( !file.exists() )
     {
@@ -137,13 +143,12 @@ void QgsHelpViewer::loadContext( const QString &contextId )
       // translate this for us message
       if ( !lang.contains( "en_" ) )
       {
-        helpContents = "<i>" + tr( "This help file is not available in your language %1. If you would like to translate it, please contact the QGIS development team." ).arg( lang ) + "</i><hr />";
+        helpContents = missingError;
       }
     }
     if ( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
     {
-      helpContents = tr( "This help file does not exist for your language:<p><b>%1</b><p>If you would like to create it, contact the QGIS development team" )
-                     .arg( fullHelpPath );
+      helpContents = missingError;
     }
     else
     {

src/helpviewer/qgshelpviewerbase.ui

@@ -22,6 +22,9 @@
    <bool>true</bool>
   </property>
   <layout class="QGridLayout" name="gridLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
    <item row="0" column="0">
     <widget class="QWebView" name="webView">
      <property name="url">