diff --git a/c3l_membership/views.py b/c3l_membership/views.py
--- a/c3l_membership/views.py
+++ b/c3l_membership/views.py
@@ -2,16 +2,26 @@ import re
 import subprocess
 from datetime import date
 
-from flask import Blueprint, current_app, render_template, request
+from flask import Blueprint, current_app, g, render_template, request
 from flask_weasyprint import HTML, render_pdf
 
 from .forms import MembershipForm
 
-root_page = Blueprint("root", __name__)
+root_page = Blueprint("root", __name__, url_prefix="/<lang_code>")
 
 xml_template = "<member><numm>{name}</numm><gebuertsdag>{birthday:%d.%m.%Y}</gebuertsdag><address>{address}</address><nick>{username}</nick><email>{email}</email><status>{status}</status><stemmrecht>{voting}</stemmrecht></member>"
 
 
+@root_page.url_defaults
+def add_lang_code(endpoint, values):
+    values.setdefault("lang_code", g.lang_code)
+
+
+@root_page.url_value_preprocessor
+def pull_lang_code(endpoint, values):
+    g.lang_code = values.pop("lang_code")
+
+
 @root_page.route("/", methods=("GET", "POST"))
 def index():
     form = MembershipForm()