Reflect RSS feeds in the UI

[roman-yagodin]

• Allow to export feeds in both Atom and RSS formats
• Update UI labels

[roman-yagodin]

Prototype markup:

<div class="alert alert-light bg-light">
<p>Подписаться на Обновления расписания:</p><p><i class="fas fa-rss-square" style="color:blue"></i> 
<a href="http://www.volgau.com/DesktopModules/R7.News.Stream/API/Feed/Atom?key=Feo49rCjA9Zggu96j2eI-g%3D%3D" target="_blank" class="" title="Канал Atom 1.0"> Atom
        </a> <i class="fas fa-rss-square" style="color:orange"></i> <a href="http://www.volgau.com/DesktopModules/R7.News.Stream/API/Feed/Rss?key=Feo49rCjA9Zggu96j2eI-g%3D%3D" target="_blank" class="" title="Канал RSS 2.0">RSS
        </a></p></div>