diff --git a/budget/run.py b/budget/run.py
index ebcf45e..3d57329 100644
--- a/budget/run.py
+++ b/budget/run.py
@@ -24,7 +24,9 @@ babel = Babel(app)
 
 @babel.localeselector
 def get_locale():
-    lang = request.accept_languages.best_match(['fr', 'en'])
+    # get the lang from the session if defined, fallback on the browser "accept
+    # languages" header.
+    lang = session.get('lang', request.accept_languages.best_match(['fr', 'en']))
     setattr(g, 'lang', lang)
     return lang
 
diff --git a/budget/templates/layout.html b/budget/templates/layout.html
index e6614d8..c546e1e 100644
--- a/budget/templates/layout.html
+++ b/budget/templates/layout.html
@@ -41,7 +41,10 @@
     </script>
 </head>
 <body>
-
+{% macro translations() %}
+<li {% if g.lang == "fr" %}class="active"{% endif %}><a href="{{ url_for(".change_lang", lang="fr") }}">fr</a></li>
+<li {% if g.lang == "en" %}class="active"{% endif %}><a href="{{ url_for(".change_lang", lang="en") }}">en</a></li>
+{% endmacro %}
 <div class="topbar">
     <h3><a class="logo" href="{{ url_for(".home") }}">#! money?</a></h3>
     {% if g.project %}
@@ -64,6 +67,11 @@
           <li><a href="{{ url_for(".exit") }}">{{ _("Logout") }}</a></li>
         </ul>
       </li>
+    {{ translations() }}
+    </ul>
+    {% else %}
+    <ul class="nav secondary-nav">
+    {{ translations() }}
     </ul>
     {% endif %}
 </div>
diff --git a/budget/web.py b/budget/web.py
index 1daecd7..82bb5f8 100644
--- a/budget/web.py
+++ b/budget/web.py
@@ -323,6 +323,13 @@ def edit_bill(bill_id):
     form.fill(bill)
     return render_template("add_bill.html", form=form, edit=True)
 
+@main.route("/lang/<lang>")
+def change_lang(lang):
+    session['lang'] = lang
+    session.update()
+
+    return redirect(request.headers.get('Referer') or url_for('.home'))
+
 @main.route("/<project_id>/compute")
 def compute_bills():
     """Compute the sum each one have to pay to each other and display it"""
