patch 8.2.3190: error messages are spread out

Problem:    Error messages are spread out.
Solution:   Move error messages to errors.h and give them a clear name.
diff --git a/src/debugger.c b/src/debugger.c
index 52a0490..1b01998 100644
--- a/src/debugger.c
+++ b/src/debugger.c
@@ -562,7 +562,7 @@
     {
 	if (curbuf->b_ffname == NULL)
 	{
-	    emsg(_(e_noname));
+	    emsg(_(e_no_file_name));
 	    return FAIL;
 	}
 	bp->dbg_type = DBG_FILE;