Remove tr_languages.h -- it is not used and is empty.

src/tr_languages.h

-/***************************************************************************
- *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
- *   email: jonsd@users.sourceforge.net                                    *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 3 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- *   GNU General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write see:                           *
- *               <http://www.gnu.org/licenses/>.                           *
- ***************************************************************************/
-
-