Solution:
in administrator\components\comlocalise\Model\PackagefileModel.php
Line 644
Change
`$app->redirect(\JRoute::('index.php?option=comlocalise&view=packagefile&layout=edit&id=' . $this->getState('packagefile.id'), false)); by $app->redirect(Route::('index.php?option=com_localise&view=packagefile&layout=edit&id=' . $this->getState('packagefile.id'), false));`
in administrator\components\comlocalise\tmpl\languages\default.php
in the line 15 add use Joomla\CMS\Router\Route;
in the line 43 change
`<form action="<?php echo JRoute::('index.php?option=comlocalise&view=languages');?>" method="post" name="adminForm" id="adminForm"> by <form action="<?php echo Route::('index.php?option=com_localise&view=languages');?>" method="post" name="adminForm" id="adminForm">`
Solution: in administrator\components\comlocalise\Model\PackagefileModel.php Line 644 Change `$app->redirect(\JRoute::('index.php?option=comlocalise&view=packagefile&layout=edit&id=' . $this->getState('packagefile.id'), false));
by
$app->redirect(Route::('index.php?option=com_localise&view=packagefile&layout=edit&id=' . $this->getState('packagefile.id'), false));`in administrator\components\comlocalise\tmpl\languages\default.php in the line 15 add use Joomla\CMS\Router\Route; in the line 43 change `<form action="<?php echo JRoute::('index.php?option=comlocalise&view=languages');?>" method="post" name="adminForm" id="adminForm">
by
<form action="<?php echo Route::('index.php?option=com_localise&view=languages');?>" method="post" name="adminForm" id="adminForm">`