helmholtz-cloud-footer: minor text changes

Modification:

- change contact text to helpdesk
- remove 'sponsor by'

src/common-components/footer/helmholtz-cloud-footer.js

@@ -86,14 +86,13 @@ class HelmholtzCloudFooter extends LitElement
             <div class="inner-footer">
                 <div class="footer-nav">
                     <nav>
-                        <a href="https://hifis.net/contact.html">Contact</a>
+                        <a href="https://hifis.net/contact.html">Helpdesk</a>
                         <a href="https://www.desy.de/imprint">Imprint</a>
                         <a href="https://www.desy.de/data_privacy_policy">Privacy</a>
                         <a href="">Declaration of Accessibility</a>
                     </nav>
                 </div>
                 <div class="helmholtz-logo-container">
-                    <p>sponsor by:</p>
                     <img src="media/i/Helmholtz_light.svg"></img>
                 </div>
             </div>