Fixed wording

svx/inc/galtheme.hrc

@@ -26,7 +26,7 @@
 #define RID_GALLERYSTR_THEME_START          (6000)
 
 // These defines are used to map gallery names to translated string ressources. Since
-// galleries may be copied from older offices to newer, do *never* change this
+// galleries may be copied from older offices to newer, do *never* change these
 // IDs except adding new ones (and adapting RID_GALLERYSTR_THEME_LAST). The ID
 // *is* written into the binary file *.thm (which is a gallery theme combined of
 // three files, *.thm, *.sdv and *.sdg)