Improve preference export description

* use better icon
* add description
* use Eclipse terms

Also remove invalid Javadoc part of preference page.

Author: Bananeweizen

net.sf.eclipsecs.ui/OSGI-INF/l10n/bundle.properties

@@ -39,8 +39,9 @@ MarkerStatsView.name = Checkstyle violations
 
 VotingPage.name = Voting
 
-CheckstylePreferenceTransfer.name = Checkstyle settings
-CheckstylePreferenceTransfer.description = Copies the workspace configuration for the Eclipse Checkstyle Plugin
+CheckstylePreferenceTransfer.name = Checkstyle Preferences
+CheckstylePreferenceTransfer.description = General Checkstyle preferences. Does NOT include Checkstyle configurations. Use the "Export" button next to the configurations table to export those.
+CheckstylePreferenceTransfer.settingsDescription = Copies the workspace configuration for the Eclipse Checkstyle Plugin
 
 PurgeCaches.label = Purge Checkstyle caches
 PurgeCaches.tooltip = Purges internal Checkstyle caches to force reloading of auxiliary configuration files (e.g. suppression.xml)

net.sf.eclipsecs.ui/plugin.xml

@@ -72,12 +72,15 @@
         <transfer
               id="net.sf.eclipsecs.ui.transfer"
               name="%CheckstylePreferenceTransfer.name"
-              icon="icons/checkstyle_error.gif">
+              icon="icons/checkstyle_command.png">
            <mapping
                  scope="instance" >
                  <entry node="net.sf.eclipsecs.core"/>
                  <entry node="net.sf.eclipsecs.ui"/>
            </mapping>
+           <description>
+              %CheckstylePreferenceTransfer.description
+           </description>
         </transfer>
         <settingsTransfer
             id="net.sf.eclipsecs.settings"

net.sf.eclipsecs.ui/src/net/sf/eclipsecs/ui/preferences/CheckstylePreferencePage.java

@@ -71,11 +71,7 @@
 import net.sf.eclipsecs.ui.util.SWTUtil;
 
 /**
- * This class represents a preference page that is contributed to the Preferences dialog. By
- * subclassing <samp>FieldEditorPreferencePage </samp>, we can use the field support built into
- * JFace that allows us to create a page that is small and knows how to save, restore and apply
- * itself.
- *
+ * This class represents a preference page that is contributed to the Preferences dialog.
  * <p>
  * This page is used to modify preferences only. They are stored in the preference store that
  * belongs to the main plug-in class. That way, preferences can be accessed directly via the