Better names for playback types

Today the playback types for recordings are shown to users as simple identifiers (and not with friendly or useful names). The idea here is let admins define a friendly name for each playback type and define if this type can be visible or not to users. To do that a new table was made to record all playback types, and now, each playback format is associated to one playback type. The names are defined as i18n keys inside the playback type table.