updated the links for images in signature

routes/routes-account.js

@@ -27,14 +27,14 @@ module.exports = function (app, config, passport, i18n) {
     'Schellingstr. 24   70174 Stuttgart<br/>' +
     'm4lab@hft-stuttgart.de<br/>' +
     'https://transfer.hft-stuttgart.de<br/>' +
-    '<a href="http://www.hft-stuttgart.de/Aktuell/"><img border="0" alt="HFT" src="HFT_logo.png"></a>  &nbsp;' +
-    '<a href="http://www.facebook.com/hftstuttgart"><img border="0" alt="Facebook" src="facebook.png"></a>  &nbsp;' +
-    '<a href="https://www.instagram.com/hft_stuttgart/"><img border="0" alt="Instagram" src="instagram.png"></a>  &nbsp;' +
-    '<a href="https://twitter.com/hft_presse"><img border="0" alt="Twitter" src="twitter.png"></a>  &nbsp;' +
-    '<a href="https://www.youtube.com/channel/UCi0_JfF2qMZbOhOnNH5PyHA"><img border="0" alt="Youtube" src="youtube.png"></a>  &nbsp;' +
+    '<a href="http://www.hft-stuttgart.de/Aktuell/"><img border="0" alt="HFT" src="https://m4lab.hft-stuttgart.de/img/signature/hft_logo.png" width="30" height="30"></a>  &nbsp;' +
+    '<a href="http://www.facebook.com/hftstuttgart"><img border="0" alt="Facebook" src="https://m4lab.hft-stuttgart.de/img/signature/fb_bw.png" width="30" height="30"></a>  &nbsp;' +
+    '<a href="https://www.instagram.com/hft_stuttgart/"><img border="0" alt="Instagram" src="https://m4lab.hft-stuttgart.de/img/signature/instagram_bw.png" width="30" height="30"></a>  &nbsp;' +
+    '<a href="https://twitter.com/hft_presse"><img border="0" alt="Twitter" src="https://m4lab.hft-stuttgart.de/img/signature/twitter_bw.png" width="30" height="30"></a>  &nbsp;' +
+    '<a href="https://www.youtube.com/channel/UCi0_JfF2qMZbOhOnNH5PyHA"><img border="0" alt="Youtube" src="https://m4lab.hft-stuttgart.de/img/signature/youtube_bw.png" width="30" height="30"></a>  &nbsp;' +
     '<a href="http://www.hft-stuttgart.de/Aktuell/Presse-Marketing/SocialMedia/Snapcode HFT_Stuttgart.jpg/photo_view">' +
-    '<img border="0" alt="Snapchat" src="snapchat.png"></a>' +
-    '<br/><img border="0" src="Innovative_Hochschule.png">'
+    '<img border="0" alt="Snapchat" src="https://m4lab.hft-stuttgart.de/img/signature/snapchat_bw.png" width="30" height="30"></a>' +
+    '<br/><img border="0" src="https://m4lab.hft-stuttgart.de/img/signature/inno_bw.png" width="150" height="100">'
 
   var samlStrategy = new SamlStrategy({
       // URL that goes from the Identity Provider -> Service Provider