patch 8.2.3970: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more errors to errors.h.
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 225f582..51cb44d 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2639,7 +2639,7 @@
 		&& !(*line == '#' && (line == cctx.ctx_line_start
 						    || VIM_ISWHITE(line[-1]))))
 	{
-	    semsg(_(e_trailing_arg), line);
+	    semsg(_(e_trailing_characters_str), line);
 	    goto erret;
 	}
 	else if (line != NULL && vim9_bad_comment(skipwhite(line)))