diff --git a/searx/infopage/__init__.py b/searx/infopage/__init__.py
index 9b181ad60..44f3bdbd7 100644
--- a/searx/infopage/__init__.py
+++ b/searx/infopage/__init__.py
@@ -116,20 +116,20 @@ class InfoPageSet:  # pylint: disable=too-few-public-methods
         self, page_class: typing.Optional[typing.Type[InfoPage]] = None, info_folder: typing.Optional[str] = None
     ):
         self.page_class = page_class or InfoPage
-        self.CACHE: typing.Dict[tuple, typing.Optional[InfoPage]] = {}
-
-        # future: could be set from settings.xml
-
         self.folder: str = info_folder or _INFO_FOLDER
         """location of the Markdwon files"""
 
+        self.CACHE: typing.Dict[tuple, typing.Optional[InfoPage]] = {}
+
         self.locale_default: str = 'en'
         """default language"""
 
-        self.locales: typing.List = [locale for locale in os.listdir(_INFO_FOLDER) if locale in LOCALE_NAMES]
+        self.locales: typing.List[str] = [
+            locale.replace('_', '-') for locale in os.listdir(_INFO_FOLDER) if locale.replace('_', '-') in LOCALE_NAMES
+        ]
         """list of supported languages (aka locales)"""
 
-        self.toc: typing.List = [
+        self.toc: typing.List[str] = [
             'search-syntax',
             'about',
         ]
@@ -161,7 +161,7 @@ class InfoPageSet:  # pylint: disable=too-few-public-methods
 
         # not yet instantiated
 
-        fname = os.path.join(self.folder, locale, pagename) + '.md'
+        fname = os.path.join(self.folder, locale.replace('-', '_'), pagename) + '.md'
         if not os.path.exists(fname):
             logger.info('file %s does not exists', fname)
             self.CACHE[cache_key] = None
@@ -171,9 +171,13 @@ class InfoPageSet:  # pylint: disable=too-few-public-methods
         self.CACHE[cache_key] = page
         return page
 
-    def all_pages(self, locale: typing.Optional[str] = None):
+    def iter_pages(self, locale: typing.Optional[str] = None, fallback_to_default=False):
         """Iterate over all pages of the TOC"""
         locale = locale or self.locale_default
-        for pagename in self.toc:
-            page = self.get_page(pagename, locale)
-            yield pagename, page
+        for page_name in self.toc:
+            page_locale = locale
+            page = self.get_page(page_name, locale)
+            if fallback_to_default and page is None:
+                page_locale = self.locale_default
+                page = self.get_page(page_name, self.locale_default)
+            yield page_name, page_locale, page
diff --git a/searx/templates/oscar/info.html b/searx/templates/oscar/info.html
index 0c2044adb..c12446a08 100644
--- a/searx/templates/oscar/info.html
+++ b/searx/templates/oscar/info.html
@@ -2,7 +2,7 @@
 {% block title %}{{ active_page.title }} - {% endblock %}
 {% block content %}
 <ul class="nav nav-tabs">
-  {% for pagename, page, locale in all_pages %}
+  {% for pagename, locale, page in all_pages %}
   <li>
     <a href="{{ url_for('info', pagename=pagename, locale=locale) }}" {% if pagename == active_pagename %}class="active"{% endif %}>{{page.title}}</a>
   </li>
diff --git a/searx/templates/simple/info.html b/searx/templates/simple/info.html
index 5030cd490..b94ad0037 100644
--- a/searx/templates/simple/info.html
+++ b/searx/templates/simple/info.html
@@ -2,7 +2,7 @@
 {% block title %}{{ active_page.title }} - {% endblock %}
 {% block content %}
 <ul class="tabs">
-{% for pagename, page, locale in all_pages %}
+{% for pagename, locale, page in all_pages %}
   <li>
     <a href="{{ url_for('info', pagename=pagename, locale=locale) }}" {% if pagename == active_pagename %}class="active"{% endif %}>{{page.title}}</a>
   </li>
diff --git a/searx/webapp.py b/searx/webapp.py
index 5d3e7ebfd..8c3e78deb 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -154,6 +154,7 @@ STATS_SORT_PARAMETERS = {
     'time': (False, 'total', 0),
     'reliability': (False, 'reliability', 100),
 }
+_INFO_PAGES = infopage.InfoPageSet()
 
 # Flask app
 app = Flask(__name__, static_folder=settings['ui']['static_path'], template_folder=templates_path)
@@ -374,7 +375,7 @@ def get_result_template(theme_name: str, template_name: str):
     return 'result_templates/' + template_name
 
 
-def url_for_theme(endpoint: str, override_theme: Optional[str] = None, **values):
+def custom_url_for(endpoint: str, override_theme: Optional[str] = None, **values):
     suffix = ""
     if endpoint == 'static' and values.get('filename'):
         theme_name = get_current_theme_name(override=override_theme)
@@ -506,7 +507,7 @@ def render(template_name: str, override_theme: str = None, **kwargs):
     kwargs['get_pretty_url'] = get_pretty_url
 
     # helpers to create links to other pages
-    kwargs['url_for'] = url_for_theme  # override url_for function in templates
+    kwargs['url_for'] = custom_url_for  # override url_for function in templates
     kwargs['image_proxify'] = image_proxify
     kwargs['proxify'] = proxify if settings.get('result_proxy', {}).get('url') else None
     kwargs['proxify_results'] = settings.get('result_proxy', {}).get('proxify_results', True)
@@ -906,34 +907,21 @@ def __get_translated_errors(unresponsive_engines: Iterable[UnresponsiveEngine]):
 @app.route('/about', methods=['GET'])
 def about():
     """Redirect to about page"""
-    locale = request.preferences.get_value('locale')
-    return redirect(url_for('info', pagename='about', locale=locale))
-
-
-_INFO_PAGES = infopage.InfoPageSet()
+    # custom_url_for is going to add the locale
+    return redirect(custom_url_for('info', pagename='about'))
 
 
 @app.route('/info/<locale>/<pagename>', methods=['GET'])
 def info(pagename, locale):
     """Render page of online user documentation"""
-
     page = _INFO_PAGES.get_page(pagename, locale)
     if page is None:
         flask.abort(404)
 
-    def all_pages():
-        user_locale = request.preferences.get_value('locale')
-        for for_pagename, for_page in _INFO_PAGES.all_pages(user_locale):
-            for_locale = locale
-            if for_page is None:
-                # we are sure that for_pagename != pagename
-                for_page = _INFO_PAGES.get_page(for_pagename, _INFO_PAGES.locale_default)
-                for_locale = _INFO_PAGES.locale_default
-            yield for_pagename, for_page, for_locale
-
+    user_locale = request.preferences.get_value('locale')
     return render(
         'info.html',
-        all_pages=all_pages(),
+        all_pages=_INFO_PAGES.iter_pages(user_locale, fallback_to_default=True),
         active_page=page,
         active_pagename=pagename,
     )
@@ -1317,9 +1305,9 @@ def stats_checker():
 def robots():
     return Response(
         """User-agent: *
-Allow: /
-Allow: /about
+Allow: /info/en/about
 Disallow: /stats
+Disallow: /image_proxy
 Disallow: /preferences
 Disallow: /*?*q=*
 """,
diff --git a/searxng_extra/docs_prebuild b/searxng_extra/docs_prebuild
index 879007f64..738fd17bd 100755
--- a/searxng_extra/docs_prebuild
+++ b/searxng_extra/docs_prebuild
@@ -24,7 +24,7 @@ def main():
         infopageset_ctx = _offline_infosetset_ctx()
 
     with infopageset_ctx as infopageset:
-        for _, page in infopageset.all_pages('en'):
+        for _, _, page in infopageset.iter_pages('en'):
             fname = os.path.join(_doc_user, os.path.basename(page.fname))
             with open(fname, 'w') as f:
                 f.write(page.content)