diff --git a/extras/source/gallery/gallery_system/sg25.sdg b/extras/source/gallery/gallery_system/sg25.sdg
deleted file mode 100644
index af78e56603e0..000000000000
Binary files a/extras/source/gallery/gallery_system/sg25.sdg and /dev/null differ
diff --git a/extras/source/gallery/gallery_system/sg25.sdv b/extras/source/gallery/gallery_system/sg25.sdv
deleted file mode 100644
index 444959152744..000000000000
Binary files a/extras/source/gallery/gallery_system/sg25.sdv and /dev/null differ
diff --git a/extras/source/gallery/gallery_system/sg25.thm b/extras/source/gallery/gallery_system/sg25.thm
deleted file mode 100644
index e7b0a497cfd0..000000000000
Binary files a/extras/source/gallery/gallery_system/sg25.thm and /dev/null differ
diff --git a/svx/inc/galtheme.hrc b/svx/inc/galtheme.hrc
index 7eda727a85f6..52b9fdd4646c 100644
--- a/svx/inc/galtheme.hrc
+++ b/svx/inc/galtheme.hrc
@@ -39,7 +39,7 @@
 #define RID_GALLERYSTR_THEME_MAPS           (RID_GALLERYSTR_THEME_START + 12)
 #define RID_GALLERYSTR_THEME_PEOPLE                     (RID_GALLERYSTR_THEME_START + 13)
 #define RID_GALLERYSTR_THEME_SURFACES                   (RID_GALLERYSTR_THEME_START + 14)
-// free
+#define RID_GALLERYSTR_THEME_HTMLBUTTONS                (RID_GALLERYSTR_THEME_START + 15)
 #define RID_GALLERYSTR_THEME_POWERPOINT                 (RID_GALLERYSTR_THEME_START + 16)
 #define RID_GALLERYSTR_THEME_SOUNDS         (RID_GALLERYSTR_THEME_START + 18)
 #define RID_GALLERYSTR_THEME_SYMBOLS                    (RID_GALLERYSTR_THEME_START + 19)
diff --git a/svx/inc/svx/gallery.hxx b/svx/inc/svx/gallery.hxx
index f7b7b56cc6e8..a2b010b9f4f0 100644
--- a/svx/inc/svx/gallery.hxx
+++ b/svx/inc/svx/gallery.hxx
@@ -41,6 +41,7 @@
 #define GALLERY_THEME_3D                1
 #define GALLERY_THEME_BULLETS       3
 #define GALLERY_THEME_HOMEPAGE      10
+#define GALLERY_THEME_HTMLBUTTONS   15
 #define GALLERY_THEME_POWERPOINT    16
 #define GALLERY_THEME_SOUNDS        18
 #define GALLERY_THEME_USERSOUNDS    21
diff --git a/svx/source/gallery2/galtheme.src b/svx/source/gallery2/galtheme.src
index 34650c5c61dc..4b63b8251d15 100644
--- a/svx/source/gallery2/galtheme.src
+++ b/svx/source/gallery2/galtheme.src
@@ -119,6 +119,14 @@ String RID_GALLERYSTR_THEME_SURFACES
 
 // -----------------------------------------------------------------------------
 
+String RID_GALLERYSTR_THEME_HTMLBUTTONS
+{
+    // !!! Don't translate, please !!!
+    Text = "private://gallery/hidden/HtmlExportButtons";
+};
+
+// -----------------------------------------------------------------------------
+
 String RID_GALLERYSTR_THEME_POWERPOINT
 {
     // !!! Don't translate, please !!!