patch 8.0.1001: setting 'encoding' makes 'printheader' invalid

Problem:    Setting 'encoding' makes 'printheader' invalid.
Solution:   Do not translate the default value of 'printheader'. (Yasuhiro
            Matsumoto, closes #2026)
diff --git a/src/option.c b/src/option.c
index 61d3579..90a11bc 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2196,7 +2196,9 @@
     {"printheader", "pheader",  P_STRING|P_VI_DEF|P_GETTEXT,
 #ifdef FEAT_PRINTER
 			    (char_u *)&p_header, PV_NONE,
-			    {(char_u *)N_("%<%f%h%m%=Page %N"), (char_u *)0L}
+			    /* untranslated to avoid problems when 'encoding'
+			     * is changed */
+			    {(char_u *)"%<%f%h%m%=Page %N", (char_u *)0L}
 #else
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)NULL, (char_u *)0L}