small carousel items don't get the right language when used drag and drop from one language to a second

# Bug Report

## Prerequisites

* [x ] Can you reproduce the problem on TYPO3 v11.5 LTS
* [x] Did you [perform a cursory search](https://github.com/issues?q=is%3Aissue+user%3Abenjaminkott+repo%3Abenjaminkott%2Fbootstrap_package)
to see if your bug or enhancement is already reported?

## Description

We are using version 12.0.7 and the TYPO3 system is on version 11.5.32(composer). If we create a small carousel in the default language with a few child elements and drag and drop it from the default language to a second language, then the carousel itself gets the correct second language, but the child elements remain on default. If the translation button is used, then the assignment is correct. It is also not a problem to directly create the element in the second language.

The error could also be on the core side.

Thank you for your great work.

## Steps to Reproduce

1. create a small carousel in the default language with a few child elements
2. drag and drop it from the default language to a second language
3. check the rendering (in the second language no Items are showed) or inside the Database the language uid

Reproduce the issue in TYPO3 11.5.32 with bootstrap_package 12.0.7 by dragging a small carousel from the default language into a second language. Compare the carousel and child elements in the database and rendering, then determine whether the language assignment is handled by the extension or TYPO3 core. Done means all child elements receive the target language and render in the translated carousel.

Written by the indexing model from the issue text.