MAPG-164 show application's name from env variable

views/game.php

@@ -12,7 +12,7 @@ $jsFiles = [
     <h1>
         <a href="/maps" title="Back to playable maps">
             <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>"><!--
-         --><span>MapGuesser</span>
+         --><span><?= $_ENV['APP_NAME'] ?></span>
         </a>
     </h1>
     <p class="header">