Fix changing video in watch page

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+# Server code documentation
+
+The server is a web server developed with [TypeScript](https://www.typescriptlang.org/)/[Express](http://expressjs.com).
+
+
+## Technologies
+
+  * [TypeScript](https://www.typescriptlang.org/) -> Language
+  * [PostgreSQL](https://www.postgresql.org/) -> Database
+  * [Express](http://expressjs.com) -> Web server framework
+  * [Sequelize](http://docs.sequelizejs.com/en/v3/) -> SQL ORM
+  * [WebTorrent](https://webtorrent.io/) -> BitTorrent tracker and torrent creation
+  * [Mocha](https://mochajs.org/) -> Test framework
+
+
+## Files
+
+The server main file is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts).
+The server modules description are in the [package.json](https://github.com/Chocobozzz/PeerTube/blob/master/package.json) at the project root.
+All other server files are in the [server](https://github.com/Chocobozzz/PeerTube/tree/master/server) directory:
+
+    server.ts -> app initilization, main routes configuration (static routes...)
+    config    -> server YAML configurations (for tests, production...)
+    scripts   -> Scripts files for npm run
+    server
+    |__ controllers  -> API routes/controllers files
+    |__ helpers      -> functions used by different part of the project (logger, utils...)
+    |__ initializers -> functions used at the server startup (installer, database, constants...)
+    |__ lib          -> library function (WebTorrent, OAuth2, ActivityPub...)
+    |__ middlewares  -> middlewares for controllers (requests validators, requests pagination...)
+    |__ models       -> Sequelize models for each SQL tables (videos, users, accounts...)
+    |__ tests        -> API tests and real world simulations (to test the decentralized feature...)
+
+
+## Conventions
+
+Uses [JavaScript Standard Style](http://standardjs.com/).
+
+
+## Developing
+
+  * Install [the dependencies](https://github.com/Chocobozzz/PeerTube#dependencies)
+  * Run `yarn install` at the root directory to install all the dependencies
+  * Run PostgreSQL and create the database `peertube_dev`.
+  * Run `npm run dev:server` to run the server, watch server files modifications and restart it automatically. The server (API + client) listen on `localhost:9000`.
+
+The `NODE_ENV=test` is set to speed up communications between instances (see [constants.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server/initializers/constants.ts)).
+
+`npm run help` gives you all available commands.
+
+If you want to test the decentralization feature, you can easily run 3 instances by running `npm run play`. The instances password are `test1`, `test2` and `test3`.
+
+
+## Architecture
+
+The server is composed by:
+
+  * a REST API (Express framework)
+  * a WebTorrent Tracker
+
+A video is seeded by the server with the [WebSeed](http://www.bittorrent.org/beps/bep_0019.html) protocol (HTTP).
+
+![Architecture scheme](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/upload-video.png)
+
+When a user uploads a video, the rest API create the torrent file and then adds it to its database.
+
+If a user wants to watch the video, the tracker will indicate all other users that are watching the video + the HTTP url for the WebSeed.
+
+## Newcomers
+
+The server entrypoint is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts). You can begin to look at this file.
+Then you can try to understand the [controllers](https://github.com/Chocobozzz/PeerTube/tree/master/server/controllers): they are the entrypoint of each API request.
diff --git a/support/doc/development/server/upload-video.png b/support/doc/development/server/upload-video.png
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