tdf#70998 Change from picture to image

Change from 'picture' to 'image' in sw/source/core/undo

Change-Id: I075bb426b13023f35ccda1d8b8ade872a52c3d61
Reviewed-on: https://gerrit.libreoffice.org/32354Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>

sw/source/core/undo/undo.src

@@ -628,7 +628,7 @@ String STR_FOOTNOTE
 };
 String STR_GRAPHIC
 {
-    Text[ en-US ] = "picture";
+    Text[ en-US ] = "image";
 };
 String STR_DRAWING_OBJECTS
 {