patch 8.2.2216: Vim9: range with missing colon can be hard to spot

Problem:    Vim9: range with missing colon can be hard to spot.
Solution:   Include the start of the range in the error. (closes #7543)
diff --git a/src/errors.h b/src/errors.h
index 4f404b5..b0b4194 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -133,8 +133,8 @@
 	INIT(= N_("E1048: Item not found in script: %s"));
 EXTERN char e_item_not_exported_in_script_str[]
 	INIT(= N_("E1049: Item not exported in script: %s"));
-EXTERN char e_colon_required_before_a_range[]
-	INIT(= N_("E1050: Colon required before a range"));
+EXTERN char e_colon_required_before_range_str[]
+	INIT(= N_("E1050: Colon required before a range: %s"));
 EXTERN char e_wrong_argument_type_for_plus[]
 	INIT(= N_("E1051: Wrong argument type for +"));
 EXTERN char e_cannot_declare_an_option[]