Add fcbk open-graph and twitter-card metas for accounts, video-channels, playlists urls

[kimsible]

Fixes: #2989

Tests :

$ npm run build:server
$ NODE_ENV=test npm start

# Playlist 
$ curl http://localhost:9000/videos/watch/playlist/:uuid

# Account
$ curl http://localhost:9000/accounts/:username

# Channel
$ curl http://localhost:9000/video-channels/:name

[Chocobozzz]

Could you add tests for accounts, channels and playlists meta tags? https://github.com/Chocobozzz/PeerTube/blob/develop/server/tests/client.ts

Maybe you could also refactor addAccountOrChannelOpenGraphAndMetaTags, addVideoPlaylistOpenGraphAndMetaTags and addVideoOpenGraphAndOEmbedTags methods that share some code

[Chocobozzz]

Please fix lint tests and https://travis-ci.com/github/Chocobozzz/PeerTube/jobs/365185689 test

[kimsible]

Please fix lint tests and https://travis-ci.com/github/Chocobozzz/PeerTube/jobs/365185689 test

I'll try but the tests still not work in local, maybe I should open an issue, it's a serious problem for contributions...

[Chocobozzz]

I'll try but the tests still not work in local, maybe I should open an issue, it's a serious problem for contributions...

Yes please

[kimsible]

Could you add tests for accounts, channels and playlists meta tags? https://github.com/Chocobozzz/PeerTube/blob/develop/server/tests/client.

I"ve added some tests, but I still have this problem with local tests #3022

Maybe you could also refactor addAccountOrChannelOpenGraphAndMetaTags, addVideoPlaylistOpenGraphAndMetaTags and addVideoOpenGraphAndOEmbedTags methods that share some code

I've refactored all these methods.

[Chocobozzz]

Thanks