diff --git a/README.md b/README.md
index 72be632..822512a 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,6 @@ In production put a reverse proxy in front of the local web ui (on 127.0.0.1:800
 
 Create `custom/templates` and put customized templates (from `src/capport/api/templates`) there.
 
-Create `i18n/<langcode>` folders to put localized templates into.
+Create `i18n/<langcode>` folders to put localized templates into (localized extends must use the full `i18n/.../basetmpl` paths though).
 
 Requests with a `setlang=<langcode>` query parameter will set the language and try to store the choice in a session cookie.
diff --git a/src/capport/api/app_cls.py b/src/capport/api/app_cls.py
index e33e2b5..f7e8220 100644
--- a/src/capport/api/app_cls.py
+++ b/src/capport/api/app_cls.py
@@ -18,26 +18,6 @@ class DispatchingJinjaLoader(quart.templating.DispatchingJinjaLoader):
     def __init__(self, app: MyQuartApp) -> None:
         super().__init__(app)
 
-    def get_source(
-        self, environment: jinja2.Environment, template: str
-    ) -> typing.Tuple[str, typing.Optional[str], typing.Optional[typing.Callable[[], bool]]]:
-        """Returns the template source from the environment.
-
-        This considers the loaders on the :attr:`app` and blueprints.
-        """
-        langs: typing.List[str] = quart.g.langs
-        for loader in self._loaders():
-            for lang in langs:
-                try:
-                    return loader.get_source(environment, os.path.join('i18n', lang, template))
-                except jinja2.TemplateNotFound:
-                    continue
-            try:
-                return loader.get_source(environment, template)
-            except jinja2.TemplateNotFound:
-                continue
-        raise jinja2.TemplateNotFound(template)
-
     def _loaders(self) -> typing.Generator[jinja2.BaseLoader, None, None]:
         if self.app.custom_loader:
             yield self.app.custom_loader
diff --git a/src/capport/api/lang.py b/src/capport/api/lang.py
index 0789b6c..5b9b033 100644
--- a/src/capport/api/lang.py
+++ b/src/capport/api/lang.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import re
 import typing
 import quart
+import os.path
 
 from .app import app
 
@@ -49,14 +50,15 @@ def detect_language():
     g = quart.g
     r = quart.request
     s = quart.session
-    lang = r.args.get('setlang')
-    if lang:
-        lang = lang.strip().lower()
+    if 'setlang' in r.args:
+        lang = r.args.get('setlang').strip().lower()
         if lang and _VALID_LANGUAGE_NAMES.match(lang):
-            s = quart.session
             s['lang'] = lang
             g.langs = [lang]
             return
+        else:
+            # reset language
+            s.pop('lang')
     lang = s.get('lang')
     if lang:
         lang = lang.strip().lower()
@@ -65,3 +67,15 @@ def detect_language():
             return
     acc_lang = ','.join(r.headers.get_all('Accept-Language'))
     g.langs = parse_accept_language(acc_lang)
+
+
+async def render_i18n_template(template, /, **kwargs) -> str:
+    langs: typing.List[str] = quart.g.langs
+    if not langs:
+        return await quart.render_template(template, **kwargs)
+    names = [
+        os.path.join('i18n', lang, template)
+        for lang in langs
+    ]
+    names.append(template)
+    return await quart.render_template(names, **kwargs)
diff --git a/src/capport/api/views.py b/src/capport/api/views.py
index ca92b8a..1066fb2 100644
--- a/src/capport/api/views.py
+++ b/src/capport/api/views.py
@@ -4,15 +4,16 @@ import ipaddress
 import logging
 import typing
 
-import capport.database
 import capport.comm.hub
 import capport.comm.message
+import capport.database
 import capport.utils.cli
 import capport.utils.ipneigh
 import quart
 from capport import cptypes
 
 from .app import app
+from .lang import render_i18n_template
 
 
 _logger = logging.getLogger(__name__)
@@ -99,11 +100,11 @@ async def user_lookup() -> cptypes.MacPublicState:
 async def index():
     state = await user_lookup()
     if not state.mac:
-        return await quart.render_template('index_unknown.html', state=state)
+        return await render_i18n_template('index_unknown.html', state=state)
     elif state.allowed:
-        return await quart.render_template('index_active.html', state=state)
+        return await render_i18n_template('index_active.html', state=state)
     else:
-        return await quart.render_template('index_inactive.html', state=state)
+        return await render_i18n_template('index_inactive.html', state=state)
 
 
 @app.route('/login', methods=['POST'])