Update page 'Variables for templates'

Variables for templates.md

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+## List of variables for the templates
+### Track names (Singles and Albums)
+* %title%
+* %album%
+* %artist%
+* %year%
+* %date%
+* %label%
+* %number%
+* %disc%
+* %isrc%
+* %explicit%
+* %genre%
+* %track_id%
+* %album_id%
+
+### Track names (Playlists)
+* %title%
+* %album%
+* %artist%
+* %year%
+* %date%
+* %label%
+* %number%
+* %position%
+* %disc%
+* %isrc%
+* %explicit%
+* %genre%
+* %track_id%
+* %album_id%
+* %playlist_id%
+
+### Playlist folders
+* %owner%
+* %name%
+* %year%
+* %date%
+* %playlist_id%
+
+### Artist folder and artwork
+* %name%
+* %artist_id%
+
+### Album folder and artwork
+* %album%
+* %artist%
+* %year%
+* %date%
+* %bitrate%
+* %type%
+* %label%
+* %album_id%
+* %upc%
+* %explicit%
+* %genre%