Added ru (русский) translation

[ashed]

I have translated your application into ru (русский). Here is the xml:

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (c) 2014 Bruno Parmentier. This file is part of DNSSetter.
  ~
  ~ DNSSetter 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.
  ~
  ~ DNSSetter 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 DNSSetter.  If not, see <https://www.gnu.org/licenses/>.
  -->

<resources>

    <string name="app_name">DNSSetter</string>
    <string name="action_about">О программе</string>
    <string name="title_activity_about">О программе</string>
    <string name="pref_title_version">Версия</string>
    <string name="pref_title_source_code">Исходный код</string>
    <string name="pref_title_developers_website">Веб-сайт разработчика</string>
    <string name="pref_title_donate_bitcoin">Пожертвовать биткойн</string>
    <string name="pref_title_license">Лицензия</string>
    <string name="pref_title_license_message" translatable="false"></string>

    <string name="firstrun_dialog_message">DNSSetter позволяет временно сменить ваши DNS серверы. До смены IP адреса или рестарта ОС.\nПриложение использует \"setprop\" метод. Если он не срабатывает, сообщите мне, я добавлю другие методы.\nВнимание! ОС должна быть рутована!</string>
    <string name="firstrun_dialog_ok">OK</string>

</resources>

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Translation made with Stringlate.