Use Add/Browse externalized strings

359104: [FileDialog] UI Strings should be localized (for translation
support)
https://bugs.eclipse.org/bugs/show_bug.cgi?id=359104
diff --git a/bundles/org.eclipse.rap.addons.filedialog/src/org/eclipse/swt/widgets/FileDialog.java b/bundles/org.eclipse.rap.addons.filedialog/src/org/eclipse/swt/widgets/FileDialog.java
index 485ac9c..2d0d498 100644
--- a/bundles/org.eclipse.rap.addons.filedialog/src/org/eclipse/swt/widgets/FileDialog.java
+++ b/bundles/org.eclipse.rap.addons.filedialog/src/org/eclipse/swt/widgets/FileDialog.java
@@ -244,7 +244,8 @@
     Composite buttonsArea = new Composite( parent, SWT.NONE );
     buttonsArea.setLayout( createGridLayout( 4, 0, 5 ) );
     buttonsArea.setLayoutData( createHorizontalFillData() );
-    createFileUpload( buttonsArea, isMulti() ? "Add" : "Browse" );
+    String text = isMulti() ? SWT.getMessage( "SWT_Add" ) : SWT.getMessage( "SWT_Browse" );
+    createFileUpload( buttonsArea, text );
     createSpacer( buttonsArea );
     okButton = createButton( buttonsArea, SWT.getMessage( "SWT_OK" ) );
     parent.getShell().setDefaultButton( okButton );
@@ -314,7 +315,7 @@
     if( isMulti() ) {
       Composite buttonsArea = fileUpload.getParent();
       hideFileUpload( fileUpload );
-      createFileUpload( buttonsArea, "Add" );
+      createFileUpload( buttonsArea, SWT.getMessage( "SWT_Add" ) );
       buttonsArea.layout();
     } else {
       fileUpload.setEnabled( false );