fix accessibility of logos

apps/files_sharing/templates/public.php

@@ -45,7 +45,11 @@ $previewSupported = OC\Preview::isMimeSupported($_['mimetype']) ? 'true' : 'fals
 <header><div id="header" class="<?php p((isset($_['folder']) ? 'share-folder' : 'share-file')) ?>">
 		<a href="<?php print_unescaped(link_to('', 'index.php')); ?>"
 		   title="" id="owncloud">
-			<div class="logo-wide svg"></div>
+			<div class="logo-wide svg">
+				<h1 class="hidden-visually">
+					<?php p($theme->getName()); ?>
+				</h1>
+			</div>
 		</a>
 		<div id="logo-claim" style="display:none;"><?php p($theme->getLogoClaim()); ?></div>
 		<div class="header-right">

core/css/header.css

@@ -48,9 +48,6 @@
 	height: 120px;
 	margin: 0 auto;
 }
-#header .logo h1 {
-	display: none;
-}
 
 #header .logo-wide {
 	background-image: url(../img/logo-wide.svg);

core/templates/layout.guest.php

@@ -32,7 +32,9 @@
 					<header>
 						<div id="header">
 							<div class="logo svg">
-								<h1><?php p($theme->getName()); ?></h1>
+								<h1 class="hidden-visually">
+									<?php p($theme->getName()); ?>
+								</h1>
 							</div>
 							<div id="logo-claim" style="display:none;"><?php p($theme->getLogoClaim()); ?></div>
 						</div>

core/templates/layout.user.php

@@ -41,7 +41,11 @@
 	</div>
 	<header><div id="header">
 			<a href="<?php print_unescaped(link_to('', 'index.php')); ?>" title="" id="owncloud">
-				<div class="logo-icon svg"></div>
+				<div class="logo-icon svg">
+					<h1 class="hidden-visually">
+						<?php p($theme->getName()); ?>
+					</h1>
+				</div>
 			</a>
 			<a href="#" class="menutoggle" tabindex="1">
 				<h1 class="header-appname">