diff --git a/_config.yml b/_config.yml
index 251d17b..e20b786 100644
--- a/_config.yml
+++ b/_config.yml
@@ -23,10 +23,20 @@ defaults:
 
     -
         scope:
-            path: "en"
+            path: "en/*"
         values:
             page_title: "Gaspard Jankowiak's homepage"
             title: "Gaspard Jankowiak's homepage"
             subtitle: "Research fellow at the University of Constance<div id='main_email'><span>gaspard</span><span></span>@<span>math.janko.fr</span></div>"
             homelink: "/en"
             fr_url: ""
+
+    -
+        scope:
+            path: "de"
+        values:
+            page_title: "Gaspard Jankowiak's homepage"
+            title: "Gaspard Jankowiak's homepage"
+            subtitle: "Research fellow at the University of Constance<div id='main_email'><span>gaspard</span><span></span>@<span>math.janko.fr</span></div>"
+            homelink: "/de/lehre"
+            fr_url: ""
diff --git a/_includes/nav_de.html b/_includes/nav_de.html
new file mode 100644
index 0000000..1da06d2
--- /dev/null
+++ b/_includes/nav_de.html
@@ -0,0 +1,5 @@
+<nav>
+<ul>
+<li><a href="/de/lehre"></a></li>
+</ul>
+</nav>
diff --git a/_includes/nav_fr.html b/_includes/nav_fr.html
index 778716a..b37a6a7 100644
--- a/_includes/nav_fr.html
+++ b/_includes/nav_fr.html
@@ -4,7 +4,7 @@
 <li><a href="/enseignement/">Enseignement</a></li>
 <li><a href="/cv">CV</a></li>
 <li><a href="https://gitea.oknaj.eu/gjankowiak/">Code</a></li>
-<li><a href="/divers">Divers</a></li>
+<li><a href="/misc">Divers</a></li>
 <li><a href="/#contact">Contact</a></li>
 </ul>
 </nav>
diff --git a/_layouts/default.html b/_layouts/default.html
index 0dc6d5f..99e7873 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -46,21 +46,31 @@
                 </header>
 
                 <section>
+                <p class="switcher">
                 {% if page.lang == 'en' %}
-                    {% if page.fr_url == '' %}
-                        <p class="switcher"><a href="{{ page.url | remove_first: '/en' }}">🇫🇷</a></p>
-                    {% else %}
-                        <p class="switcher"><a href="{{ page.fr_url }}">🇫🇷</a></p>
-                    {% endif %}
+                      <a href="{{ page.url | remove_first: '/en' }}">🇫🇷</a>
+
+                      <a href="/de/lehre">🇩🇪</a>
+                    </p>
                     {% include nav_en.html %}
+                {% else %}
+                {% if page.lang == 'de' %}
+                      <a href="/">🇫🇷</a>
+                      <a href="/en">🇬🇧</a>
+                    </p>
+                    {% include nav_de.html %}
                 {% else %}
                     {% if page.en_url == '' %}
-                        <p class="switcher"><a href="/en{{page.url}}">🇬🇧</a></p>
+                        <a href="/en{{page.url}}">🇬🇧</a>
                     {% else %}
-                        <p class="switcher"><a href="{{ page.en_url }}">🇬🇧</a></p>
+                        <a href="{{ page.en_url }}">🇬🇧</a>
                     {% endif %}
+
+                     <a href="/de/lehre">🇩🇪</a>
+                     </p>
                     {% include nav_fr.html %}
                 {% endif %}
+                {% endif %}
                 <hr>
 
                 <div id="page_subtitle">{{ page.subtitle }}</div>
diff --git a/de/lehre.markdown b/de/lehre.markdown
new file mode 100644
index 0000000..0c56060
--- /dev/null
+++ b/de/lehre.markdown
@@ -0,0 +1,12 @@
+---
+layout: default
+subtitle: Lehre
+math: true
+lang: de
+---
+
+# Theorie u. Numerik PDG
+
+## Übungen
+
+- [Blatt 1](/de/uebungen/2021/PDG/blatt_1.pdf)
diff --git a/de/uebungen/2021/PDG/blatt_1.pdf b/de/uebungen/2021/PDG/blatt_1.pdf
new file mode 100644
index 0000000..2dd035a
Binary files /dev/null and b/de/uebungen/2021/PDG/blatt_1.pdf differ
diff --git a/en/index.markdown b/en/index.markdown
index 6afd0eb..6083e19 100644
--- a/en/index.markdown
+++ b/en/index.markdown
@@ -62,15 +62,11 @@ Gaspard Jankowiak
 [ORCiD](https://orcid.org/0000-0002-9025-1465)
 {: .float-left}
 
-Office:  
-Vordere Zollamtsstraße 3  
-1030 Wien  
+Office F402  
+Fachbereich Mathematik und Statistik  
+Universität Konstanz  
+78457 Konstanz
 {: .float-right}
 
-Postal address:  
-OEAW  
-Ricam, Aussenstelle Wien  
-Dr. Ignaz Seipl Platz 2  
-1010 Wien - Autriche
 {: .float-right}
 
diff --git a/en/misc.markdown b/en/misc.markdown
index c7386de..23c68b6 100644
--- a/en/misc.markdown
+++ b/en/misc.markdown
@@ -3,7 +3,6 @@ layout: default
 math: false
 lang: en
 subtitle: 'Miscellaneous'
-fr_url: /divers
 ---
 
 ## u:access at the University of Vienna
diff --git a/enseignement/index.markdown b/enseignement/index.markdown
index 0adc153..29d374c 100644
--- a/enseignement/index.markdown
+++ b/enseignement/index.markdown
@@ -2,6 +2,7 @@
 layout: default
 subtitle: Enseignement
 math: false
+lang: fr
 en_url: /enseignement
 ---
 
diff --git a/index.markdown b/index.markdown
index 141d35b..d7e171b 100644
--- a/index.markdown
+++ b/index.markdown
@@ -1,6 +1,7 @@
 ---
 layout: default
 math: false
+lang: fr
 ---
 {% assign authors = site.data.authors %}
 
@@ -62,14 +63,10 @@ Gaspard Jankowiak
 [ORCiD](https://orcid.org/0000-0002-9025-1465)
 {: .float-left}
 
-Bureau:  
-Vordere Zollamtsstraße 3  
-1030 Wien  
+Bureau F402  
+Fachbereich Mathematik und Statistik  
+Universität Konstanz  
+78457 Konstanz
 {: .float-right}
 
-Adresse postale:  
-OEAW  
-Ricam, Aussenstelle Wien  
-Dr. Ignaz Seipl Platz 2  
-1010 Wien - Autriche
 {: .float-right}
diff --git a/divers.markdown b/misc.markdown
similarity index 100%
rename from divers.markdown
rename to misc.markdown