patch 8.2.4010: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/spellfile.c b/src/spellfile.c
index 473d600..c00930d 100644
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -4307,7 +4307,7 @@
 	{
 	    if (!spin->si_did_emsg)
 	    {
-		emsg(_("E845: Insufficient memory, word list will be incomplete"));
+		emsg(_(e_insufficient_memory_word_list_will_be_incomplete));
 		spin->si_did_emsg = TRUE;
 	    }
 	    return NULL;