<?php
namespace app\components;
use yii\web\UrlRuleInterface;
use yii\base\Object;

class JoomlaUrlRule extends Object implements UrlRuleInterface
{
    public function createUrl($manager, $route, $params)
    {
        return false;
    }

    public function parseRequest($manager, $request)
    {
        $it_joomla_url = $request->getPathInfo()==='' 
                     && $request->getQueryParam('option')==='com_content';
        if (!it_joomla_url) {
            return false;            
        }
        $view = $request->getQueryParam('view');
        if (empty($view)) {
            return false;            
        }
        return ["$view/view", $request->queryParams];
    }
}

[
    'components' => [
        'urlManager' => [
            // ...
            'rules' => [
                ['class' => 'app\components\JoomlaUrlRule'],
                // ...
            ],
        ],
    ],
]

RewriteCond %{THE_REQUEST} index.php [NC]
RewriteCond %{QUERY_STRING} option=com_content [NC]
RewriteCond %{QUERY_STRING} view=category [NC]
RewriteRule (.*) /category/view/ [L,R=301,QSA]

RewriteCond %{THE_REQUEST} index.php [NC]
RewriteCond %{QUERY_STRING} option=com_content [NC]
RewriteCond %{QUERY_STRING} view=article [NC]
RewriteRule (.*) /article/view/ [L,R=301,QSA]

RewriteCond %{THE_REQUEST} index.php [NC]
RewriteCond %{QUERY_STRING} option=com_content [NC]
RewriteCond %{QUERY_STRING} view=category [NC]
RewriteCond %{QUERY_STRING} id=(\d+) [NC]
RewriteRule (.*) /category/view?id=%1 [L,R=301]

RewriteCond %{THE_REQUEST} index.php [NC]
RewriteCond %{QUERY_STRING} option=com_content [NC]
RewriteCond %{QUERY_STRING} view=article [NC]
RewriteCond %{QUERY_STRING} id=(\d+) [NC]
RewriteRule (.*) /article/view?id=%1 [L,R=301]

<?= GridView::widget([
    'pager' => [
        'firstPageLabel' => 'Начало',
        'lastPageLabel' => 'Конец',
    ],
]) ?>