add a external link icon to viaf links, correct bug #27355 (https://mantis.culture.fr/mantis/view.php?id=27355)
<?php
namespace CorpusParole\Models;
use Illuminate\Database\Eloquent\Model;
class CocoonRevision extends Model
{
public function document() {
return $this->belongsTo('CorpusParole\Models\CocoonDocument');
}
}