Bug 525562 - Adding missing properties for ImageMergeViewer

The dialog created within the ContentMergeViewer does read the
properties from the specific Viewers Resource Bundle (e.g.
ImageMergeViewer -> ImageMergeViewerResources.properties). In that
properties file, the "saveDialog.title" and "saveDialog.message"
properties did not exist. (The get read by the ContentMergeViewer.doSave
method in case the editor is dirty).

Bug: 525562
Change-Id: I2b96afb219e6750f29d13f919666dc8c94804713
Signed-off-by: Martin Schreiber <m.schreiber@bachmann.info>
diff --git a/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/ImageMergeViewerResources.properties b/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/ImageMergeViewerResources.properties
index 291dd84f..ef2e9e5 100644
--- a/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/ImageMergeViewerResources.properties
+++ b/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/ImageMergeViewerResources.properties
@@ -15,6 +15,9 @@
 
 title= Image Compare
 
+saveDialog.title= Save Resource
+saveDialog.message= Resource has been modified. Save changes?
+
 #####################################################
 # Actions
 #####################################################