diff --git a/doc/architecture.md b/doc/architecture.md
index 0c763c7c7..b8e96d395 100644
--- a/doc/architecture.md
+++ b/doc/architecture.md
@@ -2,64 +2,64 @@
 
 ## Root
 
-`fab-manager/`
-╠═ `.docker/` In development, data of the databases are stored in this untracked folder;
-╠═ `.github/` Configuration of the GitHub repository;
-╠═ `accounting/` When some accounting exports are generated in the application, they are saved in this untracked folder;
-╠═ `app/` **The source code of the application**;
-╠═ `bin/` Ruby-on-rails binaries;
-╠═ `config/` Application and frameworks configurations are saved here. **Translations are saved here too**; 
-╠═ `coverage/` Coveralls.io saves its temporary data into this untracked folder;
-╠═ `db/` Database schema and migrations (ie. the history of the construction of the database);
-╠═ `doc/` Various documentations about Fab-manager;
-╠═ `docker/` Files used to build the docker image. Also: files to set up a development environment based on docker; 
-╠═ `exports/` When some exports are generated in the application, they are saved in this untracked folder;
-╠═ `imports/` When some files are imported to the application, they are saved in this untracked folder;
-╠═ `invoices/` When some invoices are generated in the application, they are saved in this untracked folder;
-╠═ `lib/` **Some more code of the application**. This code may not be loaded automatically;
-╠═ `log/` When running, the application will produce some debug outputs, they are saved in this untracked folder;
-╠═ `node_modules` Third party libraries for the front-end JS application are stored in this untracked folder by the package manager (yarn);
-╠═ `payment_schedules`  When some payment schedules are generated in the application, they are saved in this untracked folder;
-╠═ `plugins/` Some code can be dropped in that untracked folder to use plugins with Fab-manager;
-╠═ `provision/` Scripts used to setup a development environment based on vagrant;
-╠═ `public` Files that will be exposed to the world by the HTTP server (nginx). This includes the compilation result of the front-end application; 
-╠═ `scripts/` Some bash scripts. Scripts ran during the upgrade phrase are located here;
-╠═ `setup/` Everything needed to set up a new instance of Fab-manager, including the setup script;
-╠═ `test/` Automated tests of the application (MiniTest);
-╠═ `tmp/` Various temporary files are stored in this untracked folder;
-╠═ `vendor/` (deprecated) Previously 3rd-party assets were stored here. Now, only the fonts for the PDF generation remains here;
-╠═ `.browserslistrc` Required by babel (JS compiler) to specify target browsers for the compilation of the front-end application;
-╠═ `.coveralls.yml` Configuration of coveralls.io;
-╠═ `.dockerignore` List of files that won't be included in the docker image;
-╠═ `.env` Environment variables for development and test environments;
-╠═ `.eslitignore` List of files that won't be parsed by ESLint;
-╠═ `.eslintrc` Configuration of the JS code quality checking (ESLint);
-╠═ `.gemrc` Ruby gems configuration;
-╠═ `.gitignore` List of files that won't be tracked by the version control system (git);
-╠═ `.nvmrc` Version of node.js used in this project. This file is read by NVM in development environments;
-╠═ `.rubocop.yml` Configuration of the Ruby code quality checking (Rubocop);
-╠═ `.ruby-gemset` Used by RVM to isolate the gems of this application 
-╠═ `.ruby-version` Version of Ruby used in this project. This file is read by RVM in development environments;
-╠═ `babel.config.js` Configuration of babel (JS compiler);
-╠═ `Capfile` (deprecated) Configuration of capistrano (previous deployment system);
-╠═ `CHANGELOG.md` List of changes between releases of Fab-manager. Also contains deployment instructions for upgrading; 
-╠═ `config.ru` This file is used by Rack-based servers to start the application;
-╠═ `CONTRIBUTING.md` Contribution guidelines;
-╠═ `crowdin.yml` Configuration of the translation management system (Crowdin);
-╠═ `Dockerfile` This file list instructions to build the docker image of the application;
-╠═ `env.example` Example of configuration for the environment variables, for development and test environments;
-╠═ `Gemfile` List of third-party libraries used in the Ruby-on-Rails application;
-╠═ `Gemfile.lock` Version lock of the ruby-on-rails dependencies;
-╠═ `LICENSE.md` Publication licence of Fab-manager;
-╠═ `package.json` List of third-party libraries used in the Javascript application. Also: version number of Fab-manager;
-╠═ `postcss.config.js` Configuration of PostCSS (CSS compiler);
-╠═ `Procfile` List the process ran by foreman when starting the application in development;
-╠═ `Rakefile` Configuration of Rake (Ruby commands interpreter);
-╠═ `README.md` Entrypoint for the documentation;
-╠═ `tsconfig.json` Configuration of TypeScript;
-╠═ `Vagrantfile` Configuration of Vagrant, for development environments;
-╠═ `yarn.lock` Version lock of the javascript dependencies;
-╚═ `yarn-error.log` This untracked file keeps logs of the package manager (yarn), if any error occurs; 
+`fab-manager/`<br>
+╠═ `.docker/` In development, data of the databases are stored in this untracked folder;<br>
+╠═ `.github/` Configuration of the GitHub repository;<br>
+╠═ `accounting/` When some accounting exports are generated in the application, they are saved in this untracked folder;<br>
+╠═ `app/` **The source code of the application**;<br>
+╠═ `bin/` Ruby-on-rails binaries;<br>
+╠═ `config/` Application and frameworks configurations are saved here. **Translations are saved here too**; <br>
+╠═ `coverage/` Coveralls.io saves its temporary data into this untracked folder;<br>
+╠═ `db/` Database schema and migrations (ie. the history of the construction of the database);<br>
+╠═ `doc/` Various documentations about Fab-manager;<br>
+╠═ `docker/` Files used to build the docker image. Also: files to set up a development environment based on docker; <br>
+╠═ `exports/` When some exports are generated in the application, they are saved in this untracked folder;<br>
+╠═ `imports/` When some files are imported to the application, they are saved in this untracked folder;<br>
+╠═ `invoices/` When some invoices are generated in the application, they are saved in this untracked folder;<br>
+╠═ `lib/` **Some more code of the application**. This code may not be loaded automatically;<br>
+╠═ `log/` When running, the application will produce some debug outputs, they are saved in this untracked folder;<br>
+╠═ `node_modules` Third party libraries for the front-end JS application are stored in this untracked folder by the package manager (yarn);<br>
+╠═ `payment_schedules`  When some payment schedules are generated in the application, they are saved in this untracked folder;<br>
+╠═ `plugins/` Some code can be dropped in that untracked folder to use plugins with Fab-manager;<br>
+╠═ `provision/` Scripts used to setup a development environment based on vagrant;<br>
+╠═ `public` Files that will be exposed to the world by the HTTP server (nginx). This includes the compilation result of the front-end application; <br>
+╠═ `scripts/` Some bash scripts. Scripts ran during the upgrade phrase are located here;<br>
+╠═ `setup/` Everything needed to set up a new instance of Fab-manager, including the setup script;<br>
+╠═ `test/` Automated tests of the application (MiniTest);<br>
+╠═ `tmp/` Various temporary files are stored in this untracked folder;<br>
+╠═ `vendor/` (deprecated) Previously 3rd-party assets were stored here. Now, only the fonts for the PDF generation remains here;<br>
+╠═ `.browserslistrc` Required by babel (JS compiler) to specify target browsers for the compilation of the front-end application;<br>
+╠═ `.coveralls.yml` Configuration of coveralls.io;<br>
+╠═ `.dockerignore` List of files that won't be included in the docker image;<br>
+╠═ `.env` Environment variables for development and test environments;<br>
+╠═ `.eslitignore` List of files that won't be parsed by ESLint;<br>
+╠═ `.eslintrc` Configuration of the JS code quality checking (ESLint);<br>
+╠═ `.gemrc` Ruby gems configuration;<br>
+╠═ `.gitignore` List of files that won't be tracked by the version control system (git);<br>
+╠═ `.nvmrc` Version of node.js used in this project. This file is read by NVM in development environments;<br>
+╠═ `.rubocop.yml` Configuration of the Ruby code quality checking (Rubocop);<br>
+╠═ `.ruby-gemset` Used by RVM to isolate the gems of this application;<br>
+╠═ `.ruby-version` Version of Ruby used in this project. This file is read by RVM in development environments;<br>
+╠═ `babel.config.js` Configuration of babel (JS compiler);<br>
+╠═ `Capfile` (deprecated) Configuration of capistrano (previous deployment system);<br>
+╠═ `CHANGELOG.md` List of changes between releases of Fab-manager. Also contains deployment instructions for upgrading; <br>
+╠═ `config.ru` This file is used by Rack-based servers to start the application;<br>
+╠═ `CONTRIBUTING.md` Contribution guidelines;<br>
+╠═ `crowdin.yml` Configuration of the translation management system (Crowdin);<br>
+╠═ `Dockerfile` This file list instructions to build the docker image of the application;<br>
+╠═ `env.example` Example of configuration for the environment variables, for development and test environments;<br>
+╠═ `Gemfile` List of third-party libraries used in the Ruby-on-Rails application;<br>
+╠═ `Gemfile.lock` Version lock of the ruby-on-rails dependencies;<br>
+╠═ `LICENSE.md` Publication licence of Fab-manager;<br>
+╠═ `package.json` List of third-party libraries used in the Javascript application. Also: version number of Fab-manager;<br>
+╠═ `postcss.config.js` Configuration of PostCSS (CSS compiler);<br>
+╠═ `Procfile` List the process ran by foreman when starting the application in development;<br>
+╠═ `Rakefile` Configuration of Rake (Ruby commands interpreter);<br>
+╠═ `README.md` Entrypoint for the documentation;<br>
+╠═ `tsconfig.json` Configuration of TypeScript;<br>
+╠═ `Vagrantfile` Configuration of Vagrant, for development environments;<br>
+╠═ `yarn.lock` Version lock of the javascript dependencies;<br>
+╚═ `yarn-error.log` This untracked file keeps logs of the package manager (yarn), if any error occurs;
 
 ## Backend application
 
@@ -67,23 +67,23 @@ The backend application respects the Ruby-on-Rails conventions for MVC applicati
 It mainly provides a REST-JSON API for the frontend application.
 It also provides another REST-JSON API, open to the 3rd-party applications, and known as OpenAPI.
 
-`fab-manager/`
-╚═╦ `app/`
-  ╠═ `controllers/` Controllers (MVC);
-  ╠═ `doc/` Documentation for the OpenAPI;
-  ╠═ `exceptions/` Custom errors;
-  ╠═ `frontend/` **Source code for the frontend application**; 
-  ╠═ `helpers/` System-wide libraries and utilities. Prefer using `services/` when it's possible;
-  ╠═ `mailers/` Sending emails;
-  ╠═ `models/` Models (MVC);
-  ╠═ `pdfs/` PDF documents generation;
-  ╠═ `policies/` Access policies for the API and OpenAPI endpoints;
-  ╠═ `services/` Utilities arranged by data models; 
-  ╠═ `sweepers/` Build cached version of some data;
-  ╠═ `themes/` SASS files that overrides the frontend styles. We plan to move all styles here to build multiple themes;   
-  ╠═ `uploaders/` Handling of the uploaded files
-  ╠═ `validators/` Custom data validation (before saving);
-  ╠═ `views/` Views (MVC)
+`fab-manager/`<br>
+╚═╦ `app/`<br>
+  ╠═ `controllers/` Controllers (MVC);<br>
+  ╠═ `doc/` Documentation for the OpenAPI;<br>
+  ╠═ `exceptions/` Custom errors;<br>
+  ╠═ `frontend/` **Source code for the frontend application**; <br>
+  ╠═ `helpers/` System-wide libraries and utilities. Prefer using `services/` when it's possible;<br>
+  ╠═ `mailers/` Sending emails;<br>
+  ╠═ `models/` Models (MVC);<br>
+  ╠═ `pdfs/` PDF documents generation;<br>
+  ╠═ `policies/` Access policies for the API and OpenAPI endpoints;<br>
+  ╠═ `services/` Utilities arranged by data models; <br>
+  ╠═ `sweepers/` Build cached version of some data;<br>
+  ╠═ `themes/` SASS files that overrides the frontend styles. We plan to move all styles here to build multiple themes;   <br>
+  ╠═ `uploaders/` Handling of the uploaded files<br>
+  ╠═ `validators/` Custom data validation (before saving);<br>
+  ╠═ `views/` Views (MVC)<br>
   ╚═ `workers/` Asynchronous tasks run by Sidekiq
 
 ## Frontend application
@@ -92,24 +92,24 @@ The frontend application is historically an Angular.js MVC application.
 We are moving, step-by-step, to an application based on React.js + Typescript.
 For now, the main application is still using Angular.js but it uses some React.js components thanks to coatue-oss/react2angular.
 
-`fab-manager/`
-╚═╦ `app/`
-  ╚═╦ `frontend/`
-    ╠═ `images/` Static images used all over the frontend app;
-    ╠═ `packs/` Entry points for webpack (bundler);
-    ╠═╦ `src/`
-    ║ ╠═╦ `javascript/`
-    ║ ║ ╠═ `api/` (TS) New components to access the backend API; 
-    ║ ║ ╠═ `components/` (TS) New React.js components;
-    ║ ║ ╠═ `controllers/` (JS) Old Angular.js controllers for the views located in `app/frontend/templates`;
-    ║ ║ ╠═ `directives/` (JS) Old Angular.js directives (interface components);
-    ║ ║ ╠═ `filters/` (JS) Old Angular.js filters (processors transforming data);
-    ║ ║ ╠═ `lib/` (TS) New utilities + (JS) Old external libraries customized; 
-    ║ ║ ╠═ `models/` (TS) Typed interfaces reflecting the API data models;
-    ║ ║ ╠═ `services/` (JS) Old Angular.js components to access the backend API; 
-    ║ ║ ╠═ `typings/` (TS) Typed modules for non-JS/TS file types;
-    ║ ║ ╠═ `app.js` Entrypoint for the angular.js application;
-    ║ ║ ╠═ `plugins.js.erb` Entrypoint for embedding Fab-manager's plugins in the frontend application;
-    ║ ║ ╚═ `router.js` Configuration for UI-Router (mapping between routes, controllers and templates)
-    ║ ╚═ `stylesheets/` SASS source for the application style
+`fab-manager/`<br>
+╚═╦ `app/`<br>
+  ╚═╦ `frontend/`<br>
+    ╠═ `images/` Static images used all over the frontend app;<br>
+    ╠═ `packs/` Entry points for webpack (bundler);<br>
+    ╠═╦ `src/`<br>
+    ║ ╠═╦ `javascript/`<br>
+    ║ ║ ╠═ `api/` (TS) New components to access the backend API; <br>
+    ║ ║ ╠═ `components/` (TS) New React.js components;<br>
+    ║ ║ ╠═ `controllers/` (JS) Old Angular.js controllers for the views located in `app/frontend/templates`;<br>
+    ║ ║ ╠═ `directives/` (JS) Old Angular.js directives (interface components);<br>
+    ║ ║ ╠═ `filters/` (JS) Old Angular.js filters (processors transforming data);<br>
+    ║ ║ ╠═ `lib/` (TS) New utilities + (JS) Old external libraries customized; <br>
+    ║ ║ ╠═ `models/` (TS) Typed interfaces reflecting the API data models;<br>
+    ║ ║ ╠═ `services/` (JS) Old Angular.js components to access the backend API; <br>
+    ║ ║ ╠═ `typings/` (TS) Typed modules for non-JS/TS file types;<br>
+    ║ ║ ╠═ `app.js` Entrypoint for the angular.js application;<br>
+    ║ ║ ╠═ `plugins.js.erb` Entrypoint for embedding Fab-manager's plugins in the frontend application;<br>
+    ║ ║ ╚═ `router.js` Configuration for UI-Router (mapping between routes, controllers and templates)<br>
+    ║ ╚═ `stylesheets/` SASS source for the application style<br>
     ╚═ `templates/` Angular.js views (HTML)