tweaks: just mark four rcfile errors for translation, like the others

The messages get translated when they get stored in the linked list.
This is to economize on the number of actual calls of gettext().

src/rcfile.c

@@ -540,8 +540,8 @@ bool is_good_file(char *file)
 	/* If the thing exists, it may be neither a directory nor a device. */
 	if (stat(file, &rcinfo) != -1 && (S_ISDIR(rcinfo.st_mode) ||
 				S_ISCHR(rcinfo.st_mode) || S_ISBLK(rcinfo.st_mode))) {
-		jot_error(S_ISDIR(rcinfo.st_mode) ? _("\"%s\" is a directory") :
-										_("\"%s\" is a device file"), file);
+		jot_error(S_ISDIR(rcinfo.st_mode) ? N_("\"%s\" is a directory") :
+										N_("\"%s\" is a device file"), file);
 		return FALSE;
 	} else
 		return TRUE;
@@ -562,7 +562,7 @@ void parse_one_include(char *file, syntaxtype *syntax)
 	rcstream = fopen(file, "rb");
 
 	if (rcstream == NULL) {
-		jot_error(_("Error reading %s: %s"), file, strerror(errno));
+		jot_error(N_("Error reading %s: %s"), file, strerror(errno));
 		return;
 	}
 
@@ -630,7 +630,7 @@ void parse_includes(char *ptr)
 		for (size_t i = 0; i < files.gl_pathc; ++i)
 			parse_one_include(files.gl_pathv[i], NULL);
 	} else if (result != GLOB_NOMATCH)
-		jot_error(_("Error expanding %s: %s"), pattern, strerror(errno));
+		jot_error(N_("Error expanding %s: %s"), pattern, strerror(errno));
 
 	globfree(&files);
 	free(expanded);