* Button for back redirection at error page

feature: #5

src/views/ErrorView.vue

@@ -27,10 +27,12 @@ import Navbar from '../components/Navbar.vue'
         </p>
 
         <div class="pb-10">
+          <a @click="navigateToPrevious()" class="px-6 py-2 mr-4 text-sm font-semibold text-blue-800 bg-blue-100">
+            Zurück
+          </a>
           <RouterLink to="/" class="px-6 py-2 text-sm font-semibold text-blue-800 bg-blue-100">
-            Go home
+            Go Home
           </RouterLink>
-
         </div>
       </div>
     </div>
@@ -43,6 +45,11 @@ export default {
       message: this.$route.query.message,
       code: this.$route.query.code
     }
+  },
+  methods:{
+    navigateToPrevious() {
+      this.$router.back()
+    }
   }
 }
 </script>