diff --git a/docs/changelog.md b/docs/changelog.md
index 3d40b2b24..dd0d2a0e2 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,14 +1,27 @@
 # Changelog
 
+3.5.1 (2021-11-24)
+------------------
+
+**🐛 Fixes**
+
+* Fix filter masking (#512)
+* Fix crash filters with using ID instead of index (#518)
+
+**🚀 New features**
+
+* Allow to add dynamic links to information pages in footer (#516)
+
 3.5.0 (2021-11-14)
 ------------------
 
-To enable Outdoor module, Geotrek-admin version 2.70.0 or higher is required
+* To enable Outdoor module, Geotrek-admin version 2.70.0 or higher is required
+* To display images in Event module, Geotrek-admin version 2.72.0 or higher is required
 
 **🚀 New features**
 
-* Add outdoor sites and courses in home activity bar, seach, detail pages and offline contents (#376)
-* Add touristic events in home activity bar, seach, detail pages and offline contents (#389)
+* Add outdoor sites and courses in home activity bar, seach, detail pages and offline contents, enabled with ``enableOutdoor`` setting (#376)
+* Add touristic events in home activity bar, seach, detail pages and offline contents, enabled with ``enableTouristicEvents`` setting (#389)
 
 **✨ Improvements**
 
diff --git a/docs/customization.md b/docs/customization.md
index b29eb8b4f..c20644817 100644
--- a/docs/customization.md
+++ b/docs/customization.md
@@ -51,7 +51,12 @@ In json files, you can just override the primary keys you need. You have to over
 
     - `shouldDisplayText`: `true` to display the text on above the asset, `false` to hide it.
 
-- `footer.json` to define social networks (`facebook`, `twitter`, `youtube`, `instagram` or `fallback)` and links (based on translation labels) in footer (see example in https://github.com/GeotrekCE/Geotrek-rando-v3/blob/main/frontend/customization/config/footer.json)
+- In the `footer.json` file, you can define social networks, informations about your organization, and some links (see example in https://github.com/GeotrekCE/Geotrek-rando-v3/blob/main/frontend/customization/config/footer.json).
+
+  - Social networks: `facebook`, `twitter`, `youtube`, `instagram` or `fallback`.
+  - Contact information such as your name, address, phone number and email.
+  - Links based on the key pair `label`/`url` (can be based on translation labels for multilingual) and/or the key `informationID` whose value is equal to a flatpage identifier.
+
 - `filter.json` to define filters to hide, their order and values (see example in https://github.com/GeotrekCE/Geotrek-rando-v3/blob/main/frontend/config/filter.json). If you want to hide some of the filter, you have to override their properties with `"display": false`
 - `map.json` to define basemaps URL and attributions, center (y, x), default and max zoom level (see example in https://github.com/GeotrekCE/Geotrek-rando-v3/blob/main/frontend/customization/config/map.json).
 
diff --git a/docs/installation.md b/docs/installation.md
index 70e7a2d51..30ed867dd 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -98,6 +98,28 @@ docker-compose pull && docker-compose down && docker-compose up -d
 
 It will download and install the latest version of Geotrek-rando. If you want to install a specific version of Geotrek-rando, you can specify it in your `.env` file, instead of `latest`.
 
+### Manage Docker images storage on disk:
+
+The old images will stay on your system and use disk storage.
+
+To remove images without container associated, you can run `docker image prune -a`.
+You can also run `docker container prune` to remove all stopped containers. Run `docker ps -a` to list all containers on your system.
+
+Use case: after several images built on my server to update and customize my Geotrek-rando, my `/var/lib/docker/vfs` folder had a size of 81 Go! Identified with `sudo du -sh /var/lib/docker/vfs` command. After running `docker container prune` its size was reduced to 14 Go. And after running `docker image prune -a` its size was 7 Go.
+
+See https://docs.docker.com/config/pruning/ for more details about cleaning unused Dockers objects.
+
+Another method: If you notice a unexpectedly large amount of images remaining on your system when asking Docker for images with the command `docker images -a` (showing all the otherwise hidden intermediate images), you can start from a clean slate and delete all the existing docker images on your system by running:
+`docker rmi $(docker images -a -q) -f`.
+Docker supports subqueries like this one, let's understand it step by step:
+
+- `docker rmi` is the command to delete an image
+- `$()` defines the subquery
+  - `docker images` list images
+  - `-a` (all) specifies that you want to see all of them even the intermediate ones
+  - `-q` (quiet) specifies that you only need to get the images IDs
+- `-f` (force) means you want to bypass docker security preventing you to delete used images
+
 # Install without Docker (not recommended)
 
 If you can't install Docker for some reason, there is also a way to directly deploy the node server to your machines.
diff --git a/frontend/customization/config/filter.json b/frontend/customization/config/filter.json
index fe51488c7..5c99ad834 100644
--- a/frontend/customization/config/filter.json
+++ b/frontend/customization/config/filter.json
@@ -1 +1,14 @@
-[]
+[
+  {
+    "id": "cities",
+    "display": false
+  },
+  {
+    "id": "structures",
+    "display": false
+  },
+  {
+    "id": "difficulty",
+    "display": false
+  }
+]
diff --git a/frontend/customization/config/footer.json b/frontend/customization/config/footer.json
index 1e2a3785f..2394b8c66 100644
--- a/frontend/customization/config/footer.json
+++ b/frontend/customization/config/footer.json
@@ -4,6 +4,9 @@
     { "id": "twitter", "url": "https://twitter.com/pnecrins" }
   ],
   "links": [
+    {
+      "informationID": 4
+    },
     { "label": "footer.links", "url": "https://www.ecrins-parcnational.fr/liens-internet" },
     { "label": "footer.access", "url": "https://www.ecrins-parcnational.fr/venir-dans-les-ecrins" },
     {
diff --git a/frontend/package.json b/frontend/package.json
index 2d3a74cdd..c6dcccb8f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "geotrek-rando-frontend",
-  "version": "3.5.0",
+  "version": "3.5.1",
   "private": true,
   "scripts": {
     "debug": "NODE_OPTIONS='--inspect' next ./src",
diff --git a/frontend/src/components/Footer/PortalLinks/PortalLinks.tsx b/frontend/src/components/Footer/PortalLinks/PortalLinks.tsx
index 4beb9430c..b12dc9e60 100644
--- a/frontend/src/components/Footer/PortalLinks/PortalLinks.tsx
+++ b/frontend/src/components/Footer/PortalLinks/PortalLinks.tsx
@@ -1,14 +1,14 @@
-import { Link } from 'components/Link';
+import NextLink from 'next/link';
 import { Plus } from 'components/Icons/Plus';
 import { Minus } from 'components/Icons/Minus';
 import { FormattedMessage } from 'react-intl';
 import { usePortalLinks } from './usePortalLinks';
-import { PortalLink } from '../interface';
+import { PortalLinkStatic } from '../interface';
 import { isLinkInternal, linkWithoutHost } from '../utils';
 
 interface PortalLinksContentProps {
   className?: string;
-  links: PortalLink[];
+  links: PortalLinkStatic[];
 }
 
 export interface PortalLinksProps extends PortalLinksContentProps {
@@ -92,16 +92,16 @@ const PortalLinksMobileContent: React.FC<PortalLinksContentProps> = ({ className
   );
 };
 
-const PortalLinkRendered: React.FC<{ link: PortalLink }> = ({ link }) => {
+const PortalLinkRendered: React.FC<{ link: PortalLinkStatic }> = ({ link }) => {
   const className =
     'text-greySoft text-Mobile-C3 desktop:text-P1 cursor-pointer hover:text-white transition-all desktop:text-right';
   if (typeof window !== 'undefined') {
     return isLinkInternal(link.url) ? (
-      <Link href={linkWithoutHost(link.url)}>
-        <div className={className}>
+      <NextLink href={linkWithoutHost(link.url)}>
+        <a className={className}>
           <FormattedMessage id={link.label} />
-        </div>
-      </Link>
+        </a>
+      </NextLink>
     ) : (
       <a href={link.url} target="_blank" rel="noopener noreferrer" className={className}>
         <FormattedMessage id={link.label} />
diff --git a/frontend/src/components/Footer/interface.ts b/frontend/src/components/Footer/interface.ts
index b330bb488..89e67e993 100644
--- a/frontend/src/components/Footer/interface.ts
+++ b/frontend/src/components/Footer/interface.ts
@@ -11,13 +11,25 @@ export interface PortalContact {
   mail: string;
 }
 
-export interface PortalLink {
+export interface PortalLinkStatic {
   label: string;
   url: string;
 }
 
-export interface FooterConfig {
+interface PortalLinkDynamic {
+  informationID: number;
+}
+
+export type PortalLink = PortalLinkStatic | PortalLinkDynamic;
+
+export interface FooterConfigInput {
   socialNetworks?: SocialNetwork[];
   links?: PortalLink[];
   contact?: Partial<PortalContact>;
 }
+
+export interface FooterConfigOutput {
+  socialNetworks?: SocialNetwork[];
+  links?: PortalLinkStatic[];
+  contact?: Partial<PortalContact>;
+}
diff --git a/frontend/src/components/Footer/useFooter.ts b/frontend/src/components/Footer/useFooter.ts
index a549003a7..ab150dcba 100644
--- a/frontend/src/components/Footer/useFooter.ts
+++ b/frontend/src/components/Footer/useFooter.ts
@@ -1,7 +1,12 @@
 import getNextConfig from 'next/config';
-import { FooterConfig } from './interface';
+import { useRouter } from 'next/router';
+import { useQuery } from 'react-query';
+import { getFlatPages } from 'modules/flatpage/connector';
+import { MenuItem } from 'modules/header/interface';
+import { getDefaultLanguage } from 'modules/header/utills';
+import { FooterConfigInput, FooterConfigOutput, PortalLinkStatic } from './interface';
 
-const getFooterConfig = (): FooterConfig => {
+const getFooterConfig = (): FooterConfigInput => {
   const {
     publicRuntimeConfig: { footer },
   } = getNextConfig();
@@ -9,7 +14,29 @@ const getFooterConfig = (): FooterConfig => {
   return footer;
 };
 
-export const useFooter = (): { config: FooterConfig } => {
-  const config = getFooterConfig();
-  return { config };
+export const useFooter = (): { config: FooterConfigOutput } => {
+  const { links, ...rest } = getFooterConfig();
+  let nextLinks;
+  // If the footer config contains `informationID` keys,the app retrieves "flatpages" to get the corresponding label/url
+  if (links && links.some(link => 'informationID' in link)) {
+    const language = useRouter().locale ?? getDefaultLanguage();
+    const { data } = useQuery<MenuItem[], Error>(['header', language], () =>
+      getFlatPages(language),
+    );
+    nextLinks = links
+      .map(link => {
+        if ('informationID' in link) {
+          const page = data?.find(({ id }) => id === link.informationID);
+          if (page) {
+            return { label: page.title, url: page.url };
+          }
+          return null;
+        }
+        return link;
+      })
+      // If the informationID doesn't match with any flatPage id, it won't be displayed
+      .filter(Boolean) as PortalLinkStatic[];
+  }
+
+  return { config: { links: nextLinks ?? (links as PortalLinkStatic[]), ...rest } };
 };
diff --git a/frontend/src/components/Footer/utils.tsx b/frontend/src/components/Footer/utils.tsx
index 6b45f83d7..5f388466b 100644
--- a/frontend/src/components/Footer/utils.tsx
+++ b/frontend/src/components/Footer/utils.tsx
@@ -1,12 +1,9 @@
 export const isLinkInternal = (urlString: string): boolean => {
-  if (typeof window !== 'undefined') {
-    const url = new URL(urlString);
-    return url.hostname === window.location.hostname;
-  }
-  return false;
+  const { hostname } = new URL(urlString, document.baseURI);
+  return hostname === global.location.hostname;
 };
 
 export const linkWithoutHost = (urlString: string): string => {
-  const url = new URL(urlString);
-  return url.pathname;
+  const { pathname } = new URL(urlString, document.baseURI);
+  return pathname;
 };
diff --git a/frontend/src/components/Header/BurgerMenu/__tests__/BurgerMenu.test.tsx b/frontend/src/components/Header/BurgerMenu/__tests__/BurgerMenu.test.tsx
index ecef9be9b..d5318fe7c 100644
--- a/frontend/src/components/Header/BurgerMenu/__tests__/BurgerMenu.test.tsx
+++ b/frontend/src/components/Header/BurgerMenu/__tests__/BurgerMenu.test.tsx
@@ -17,16 +17,19 @@ test('AAU, I can see a BurgerMenu', () => {
           title: 'NationalPark',
           url: 'https://www.ecrins-parcnational.fr/',
           order: 1,
+          id: 2,
         },
         {
           title: 'Maisons du Parc',
           url: 'https://www.ecrins-parcnational.fr/',
           order: 2,
+          id: 1,
         },
         {
           title: 'Informations utiles',
           url: 'https://www.ecrins-parcnational.fr/',
           order: 3,
+          id: 3,
         },
       ]}
     />,
diff --git a/frontend/src/modules/filters/utils.ts b/frontend/src/modules/filters/utils.ts
index 12f0b8fc2..95405e7a2 100644
--- a/frontend/src/modules/filters/utils.ts
+++ b/frontend/src/modules/filters/utils.ts
@@ -212,11 +212,15 @@ export const computeFiltersToDisplay = ({
   outdoorRatingScale: OutdoorRatingScale[];
   outdoorPractice: OutdoorPracticeChoices;
 }): FilterState[] => {
-  const currentNumberOfPracticeOptionsSelected = currentFiltersState[0].selectedOptions.length;
+  const trekPracticeFilter = currentFiltersState.find(i => i.id === PRACTICE_ID);
+  const touristicContentFilter = currentFiltersState.find(i => i.id === CATEGORY_ID);
+  const outdoorPracticeFilter = currentFiltersState.find(i => i.id === OUTDOOR_ID);
+
+  const currentNumberOfPracticeOptionsSelected = trekPracticeFilter?.selectedOptions.length ?? 0;
   const currentNumberOfTouristicContentOptionsSelected =
-    currentFiltersState[1].selectedOptions.length;
+    touristicContentFilter?.selectedOptions.length ?? 0;
   const currentNumberOfOutdoorPraticeOptionsSelected =
-    currentFiltersState[6].selectedOptions.length;
+    outdoorPracticeFilter?.selectedOptions.length ?? 0;
 
   const filtersToAdd: FilterState[][] = [];
 
@@ -227,7 +231,7 @@ export const computeFiltersToDisplay = ({
   }
   // Services filters
   if (currentNumberOfTouristicContentOptionsSelected > 0 || selectedFilterId === CATEGORY_ID) {
-    currentFiltersState[1].selectedOptions.forEach(selectedOptions => {
+    touristicContentFilter?.selectedOptions.forEach(selectedOptions => {
       filtersToAdd.push(
         getTypesFiltersState({
           serviceId: selectedOptions.value,
@@ -238,7 +242,7 @@ export const computeFiltersToDisplay = ({
   }
   // Outdoor filters
   if (currentNumberOfOutdoorPraticeOptionsSelected > 0 || selectedFilterId === OUTDOOR_ID) {
-    currentFiltersState[6].selectedOptions.forEach(selectedOptions => {
+    outdoorPracticeFilter?.selectedOptions.forEach(selectedOptions => {
       filtersToAdd.push(
         getOutdoorRatingFiltersState({
           practiceId: selectedOptions.value,
diff --git a/frontend/src/modules/flatpage/adapter.ts b/frontend/src/modules/flatpage/adapter.ts
index f50dc2a94..73f084d59 100644
--- a/frontend/src/modules/flatpage/adapter.ts
+++ b/frontend/src/modules/flatpage/adapter.ts
@@ -10,6 +10,7 @@ const adaptFlatPageToMenuItem = (rawFlatPage: RawFlatPage): MenuItem => ({
       : generateFlatPageUrl(rawFlatPage.id, rawFlatPage.title),
   title: rawFlatPage.title,
   order: rawFlatPage.order,
+  id: rawFlatPage.id,
 });
 
 export const adaptFlatPages = (rawFlatPages: RawFlatPage[]): MenuItem[] => {
diff --git a/frontend/src/modules/header/interface.ts b/frontend/src/modules/header/interface.ts
index 8adeb5f7c..46703055b 100644
--- a/frontend/src/modules/header/interface.ts
+++ b/frontend/src/modules/header/interface.ts
@@ -1,10 +1,12 @@
 export interface MenuItem {
+  id: number;
   title: string;
   url: string;
   order: number | null;
 }
 
 export interface OrderableMenuItem {
+  id: number;
   title: string;
   url: string;
   order: number;
diff --git a/frontend/src/services/getConfig.js b/frontend/src/services/getConfig.js
index 5e92d6341..91d5e3ffd 100644
--- a/frontend/src/services/getConfig.js
+++ b/frontend/src/services/getConfig.js
@@ -18,7 +18,7 @@ const getConfig = (file, parse = true) => {
   }
 
   const merge = (elem1, elem2) => {
-    if (Array.isArray(elem1)) return [...elem1, ...elem2];
+    if (Array.isArray(elem1)) return [...elem2, ...elem1];
     else return { ...elem1, ...elem2 };
   };