Use mu_true_answer_p()

@@ -139,7 +139,7 @@ parse_headers (FILE *fp, compose_env_t *env)
       
       header_destroy (&header, NULL);
       p = ml_readline (_("Edit again?"));
-      if (*p == 'y' || *p == 'Y')
+      if (mu_true_answer_p (p) == 1)
 	return -1;
       else
 	return 1;

@@ -63,7 +63,7 @@ extern char *strchrnul __P((const char *s, int c_in));
 #define MH_CONTEXT_FILE "context"
 #define DEFAULT_ALIAS_FILE MHLIBDIR "/MailAliases"
 
-#define is_true(arg) ((arg)==NULL||(arg)[0] == 'y')
+#define is_true(arg) ((arg) == NULL||mu_true_answer_p (arg) == 1)
 
 enum mh_opcode
 {

@@ -256,7 +256,7 @@ mh_vgetyn (const char *fmt, va_list ap)
   while (1)
     {
       char *p;
-      int len;
+      int len, rc;
       
       vfprintf (stdout, fmt, ap);
       fprintf (stdout, "? ");
@@ -270,16 +270,12 @@ mh_vgetyn (const char *fmt, va_list ap)
       while (*p && isspace (*p))
 	p++;
 
-      switch (p[0])
-	{
-	case 'y':
-	case 'Y':
-	  return 1;
-	case 'n':
-	case 'N':
-	  return 0;
-	}
+      rc = mu_true_answer_p (p);
+
+      if (rc >= 0)
+	return rc;
 
+      /* TRANSLATORS: See msgids "nN" and "yY". */
       fprintf (stdout, _("Please answer yes or no: "));
     }
   return 0; /* to pacify gcc */

@@ -117,16 +117,12 @@ static int sieve_print_locus = 1; /* Should the log messages include the
 static int
 is_true_p (char *p)
 {
+  int rc;
   if (!p)
     return 1;
-  /* TRANSLATORS: This is the list of characters meaning 'Yes'. Please, 
-     preserve yY in your translation, e.g., for German:
-
-     msgstr "yYjJ";
-  */
-  if (strchr (_("yY"), *p))
-    return 1;
+  if ((rc = mu_true_answer_p (p)) == -1)
     return 0;
+  return rc;
 }
 
 static error_t