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/job.c b/src/job.c
index 36ff524..c556e01 100644
--- a/src/job.c
+++ b/src/job.c
@@ -131,7 +131,7 @@
 	return OK;
     if (tv->v_type != VAR_DICT)
     {
-	emsg(_(e_dictreq));
+	emsg(_(e_dictionary_required));
 	return FAIL;
     }
     dict = tv->vval.v_dict;