patch 8.2.3750: error messages are everywhere

Problem:    Error messages are everywhere.
Solution:   Move more error messages to errors.h and adjust the names.
diff --git a/src/os_unix.c b/src/os_unix.c
index ef5533c..f93bc95 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6797,7 +6797,7 @@
 	    if (!(flags & EW_SILENT))
 #endif
 	    {
-		msg(_(e_wildexpand));
+		msg(_(e_cannot_expand_wildcards));
 		msg_start();		// don't overwrite this message
 	    }
 	}
@@ -6817,7 +6817,7 @@
 	// Something went wrong, perhaps a file name with a special char.
 	if (!(flags & EW_SILENT))
 	{
-	    msg(_(e_wildexpand));
+	    msg(_(e_cannot_expand_wildcards));
 	    msg_start();		// don't overwrite this message
 	}
 	vim_free(tempname);