tdf#79877 add button text for 'previous' button (gtk-media-previous)

Change-Id: I605849cd753ed3f33b8dec5921488730dc9682dd
Reviewed-on: https://gerrit.libreoffice.org/42332Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/inc/strings.hrc

@@ -70,6 +70,7 @@
 #define SV_BUTTONTEXT_UNDO                           NC_("SV_BUTTONTEXT_UNDO", "~Undo")
 #define SV_BUTTONTEXT_PASTE                          NC_("SV_BUTTONTEXT_PASTE", "~Paste")
 #define SV_BUTTONTEXT_NEXT                           NC_("SV_BUTTONTEXT_NEXT", "~Next")
+#define SV_BUTTONTEXT_PREV                           NC_("SV_BUTTONTEXT_PREV", "~Previous")
 #define SV_BUTTONTEXT_GO_UP                          NC_("SV_BUTTONTEXT_GO_UP", "~Up")
 #define SV_BUTTONTEXT_GO_DOWN                        NC_("SV_BUTTONTEXT_GO_DOWN", "Do~wn")
 #define SV_BUTTONTEXT_CLEAR                          NC_("SV_BUTTONTEXT_CLEAR", "~Clear")

vcl/source/window/builder.cxx

@@ -632,6 +632,8 @@ namespace
             return VclResId(SV_BUTTONTEXT_PASTE);
         else if (rType == "gtk-media-next")
             return VclResId(SV_BUTTONTEXT_NEXT);
+        else if (rType == "gtk-media-previous")
+            return VclResId(SV_BUTTONTEXT_PREV);
         else if (rType == "gtk-go-up")
             return VclResId(SV_BUTTONTEXT_GO_UP);
         else if (rType == "gtk-go-down")