patch 8.2.3967: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/map.c b/src/map.c
index 94d2bdf..b8e7c05 100644
--- a/src/map.c
+++ b/src/map.c
@@ -2362,7 +2362,7 @@
 
     if (argvars[2].v_type != VAR_DICT)
     {
-	emsg(_(e_dictkey));
+	emsg(_(e_key_not_present_in_dictionary));
 	return;
     }
     d = argvars[2].vval.v_dict;