controller.php

<?php

namespace App\Http\Controllers;

use App\Repositories\NewsRepository;
use Illuminate\Http\Request;
use Illuminate\View\View;

/**
 * Class NewsController
 *
 * @package App\Http\Controllers
 */
class NewsController extends Controller
{
    private $newsRepository; /** @var NewsRepository $newsRepository */

    /**
     * NewsController constructor.
     *
     * @param NewsRepository $newsRepository
     *
     * @return void
     */
    public function __construct(NewsRepository $newsRepository)
    {
        $this->middleware('auth');
        $this->middleware('lang');

        $this->newsRepository = $newsRepository;
    }

    /**
     * Get the admin control panel for the news messages.
     *
     * @return \Illuminate\View\View
     */
    public function backendIndex(): View
    {
        return view('news.backend-index', [
            'messages' => $this->newsRepository->entity()->simplePaginate(15)
        ]);
    }

    public function create(): View
    {
        return view('news.backend-create');
    }

    public function store(Request $input)
    {
        dd($input->all());
    }
}

dd.txt

array:1 [▼
  "_token" => "IXQeQuWKz7icr8NuewrNT626z5gyB9v5D02ESlcP"
]

view.blade.php

<div class="form-group row">
    <label class="col-lg-2 col-form-label text-lg-right">Titel: <span class="text-danger">*</span></label>

    <div class="col-lg-10">
        <input type="text" class="form-control{{ $errors->has('1.dutch.title') ? ' is-invalid' : '' }}" name="[0][dutch][title]" value="{{ old('1.dutch.title') }}">

        @if ($errors->has('1.title'))
            <div class="invalid-feedback">
                <strong>{{ $errors->first('1.dutch.title') }}</strong>
            </div>
        @endif
    </div>
</div>

<div class="form-group row">
    <label class="col-lg-2 col-form-label text-lg-right">Categoieen: <span class="text-danger">*</span></label>

    <div class="col-lg-10">
        <input type="text" placeholder="Bericht categorieen" class="form-control{{ $errors->has('2.dutch.categories') ? ' is-invalid' : '' }}" name="[2][dutch][categories]" value="{{ old('2.dutch.categories') }}">
    </div>
</div>

<div class="form-group row">
    <label class="col-lg-2 col-form-label text-lg-right">Bericht: <span class="text-danger">*</span></label>

    <div class="col-lg-10">
        <textarea name="[3][dutch][message]" rows="7" placeholder="Uw nieuwsbericht" class="form-control{{ $errors->has('3.dutch.message') ? 'is-invalid' : ''}}">{{ old('.dutch.message') }}</textarea>

        @if ($errors->has('3.dutch.message'))
            <div class="invalid-feedback">
                <strong>{{ $errors->first('3.dutch.message') }}</strong>
            </div>
        @endif
    </div>
</div>

@push('scripts')
    <script src="https://cdn.ckeditor.com/4.7.3/standard/ckeditor.js"></script>
    <script>
        CKEDITOR.replace('[3][dutch][message]');
        // CKEDITOR.replace('[3][french][message]');
        // CKEDITOR.replace('[3][english][message]');
    </script>
@endpush