Warnings when deleting records in the front end

[fritzmg]

When records are deleted, warnings can appear (albeit only in sentry) due to missing translations. For example:

ErrorException: Warning: Trying to access array offset on value of type null
#42 /vendor/contao/news-bundle/src/Resources/contao/modules/ModuleNewsList.php(43): Contao\ModuleNewsList::generate
[…]
#21 /vendor/contao/core-bundle/src/Resources/contao/library/Contao/Controller.php(622): Contao\Controller::getContentElement
#20 /var/cache/prod/contao/dca/tl_content.php(318): tl_content::addCteType
[…]
#16 /vendor/contao/core-bundle/src/EventListener/DataContainer/RecordPreviewListener.php(85): Contao\CoreBundle\EventListener\DataContainer\RecordPreviewListener::compilePreview
#15 /vendor/contao/core-bundle/src/EventListener/DataContainer/RecordPreviewListener.php(67): Contao\CoreBundle\EventListener\DataContainer\RecordPreviewListener::storePrecompiledRecordPreview
#14 /vendor/contao/core-bundle/src/Resources/contao/drivers/DC_Table.php(1542): Contao\DC_Table::delete
#13 /vendor/madeyourday/contao-rocksolid-frontend-helper/src/Controller/JsonApiController.php(258): MadeYourDay\RockSolidFrontendHelper\Controller\JsonApiController::callDcaMethod
#12 /vendor/madeyourday/contao-rocksolid-frontend-helper/src/Controller/JsonApiController.php(184): MadeYourDay\RockSolidFrontendHelper\Controller\JsonApiController::deleteAction
[…]
#0 /public/index.php(44): null

I have shortened the stack trace a bit, as it would be very long in this case. Basically what happens is, that the JsonApiController instantiates the respective data container to call ->delete() on it - but this in turn triggers the ondelete_callback which in turn triggers other callbacks that will in turn render the content elements in this case. But within the JsonApiController's context, no translations are loaded and thus a warning occurs when the news list module is rendered for the back end for example.

Not really sure how to solve this though 🤔. I mean we could add System::loadLanguageFile('default') in the JsonApiController's actions. However, since it executes back end actions it might also need to load other language files.