changed the things according to the comments in the merge request

index.html

@@ -29,7 +29,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 	<link rel="shortcut icon" type="image/png" href="favicon.png" />
 	<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
 	<link rel="apple-touch-icon-precomposed" href="apple-touch-icon-precomposed.png" />
-	<link rel="apple-touch-startup-image" href="splash.png" />
 	<meta name="apple-mobile-web-app-capable" content="yes" />
 	<meta name="apple-mobile-web-app-status-bar-style" content="black" />
 	<meta name="apple-mobile-web-app-title" content="Bärneruhr" />

manifest.appcache

@@ -9,7 +9,6 @@ index.html
 jquery-2.1.0.min.js
 jquery-cookie-1.4.0.js
 jquery-ui-1.10.4.custom.min.js
-splash.png
 uhr-black.css
 uhr-blue.css
 uhr-de.js