Fixed translation links in mobile menu not working properly; improved translation

public/de/about/index.html

@@ -115,7 +115,7 @@ Below you can read the original about from Radek
     </div>
     
       <ul class="menu menu--mobile">
-  <li class="menu__trigger">Menu&nbsp;▾</li>
+  <li class="menu__trigger">Menü&nbsp;▾</li>
   <li>
     <ul class="menu__dropdown">
       
@@ -131,11 +131,11 @@ Below you can read the original about from Radek
         <hr />
         
           <li>
-            <a href="/en/">English</a>
+            <a href='/en/about/'>English</a>
           </li>
         
           <li>
-            <a href="/de/">Deutsch</a>
+            <a href='/de/about/'>Deutsch</a>
           </li>