patch 8.2.2015: Vim9: literal dict #{} is not like any other language

Problem:    Vim9: literal dict #{} is not like any other language.
Solution:   Support the JavaScript syntax.
diff --git a/src/errors.h b/src/errors.h
index 5ba6d52..c7aad12 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -303,3 +303,5 @@
 	INIT(= N_("E1137: <Cmd> mapping must not include %s key"));
 EXTERN char e_using_bool_as_number[]
 	INIT(= N_("E1138: Using a Bool as a Number"));
+EXTERN char e_missing_matching_bracket_after_dict_key[]
+	INIT(= N_("E1139: Missing matching bracket after dict key"));