patch 9.1.0039: too vague errors for 'listchars'/'fillchars'

Problem:  too vague errors for 'listchars'/'fillchars'
Solution: Include the field name in error message.
          (zeertzjq)

related: neovim/neovim#27050
closes: #13877

Co-authored-by: Cole Frankenhoff <cole.nhf@gmail.com>
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/errors.h b/src/errors.h
index dfb6ce6..bfa4929 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3602,3 +3602,7 @@
 	INIT(= N_("E1509: Error occurred when reading or writing extended attribute"));
 EXTERN char e_val_too_large[]
 	INIT(= N_("E1510: Value too large: %s"));
+EXTERN char e_wrong_number_of_characters_for_field_str[]
+	INIT(= N_("E1511: Wrong number of characters for field \"%s\""));
+EXTERN char e_wrong_character_width_for_field_str[]
+	INIT(= N_("E1512: Wrong character width for field \"%s\""));