[LyX/master] Improve error msg.

[Jean-Marc Lasgouttes]

Le 21/10/2021 à 14:57, Pavel Sanda a écrit :
> -			rcsmsg = "\n" + _("Perhaps the RCS package is not installed on your system?");
> +			rcsmsg = "\n" + _("Perhaps the GNU RCS package is not installed on your system?");

Or maybe "Check that the GNU RCS package is installed on your system."

JMarc