patch 8.2.3986: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move more error messages to errors.h.
diff --git a/src/fileio.c b/src/fileio.c
index 01953d9..7390309 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -4385,8 +4385,7 @@
 	    if (savebuf == NULL || saved == FAIL || buf != curbuf
 				      || move_lines(buf, savebuf) == FAIL)
 	    {
-		semsg(_("E462: Could not prepare for reloading \"%s\""),
-							    buf->b_fname);
+		semsg(_(e_could_not_prepare_for_reloading_str), buf->b_fname);
 		saved = FAIL;
 	    }
 	}