patch 8.2.4012: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move the last error messages to errors.h.
diff --git a/src/help.c b/src/help.c
index f07a8fc..fca7cfc 100644
--- a/src/help.c
+++ b/src/help.c
@@ -1201,7 +1201,7 @@
 						    EW_FILE|EW_SILENT) == FAIL
 	    || filecount == 0)
     {
-	semsg(_("E151: No match: %s"), NameBuff);
+	semsg(_(e_no_match_str_1), NameBuff);
 	return;
     }