Fix that POST card's message is disappearing when language/iconset change occurs

src/unix/unix.c

@@ -453,6 +453,12 @@ ui_sb_update_panes()
 
 }
 
+void
+ui_sb_update_text()
+{
+
+}
+
 void
 plat_get_dirname(char *dest, const char *path)
 {