<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

class CreateTranslationTranslationTranslationsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('translation__translation_translations', function (Blueprint $table) {
            $table->engine = 'InnoDB';
            $table->increments('id');
            $table->text('value');

            $table->integer('translation_id')->unsigned();
            $table->string('locale')->index();
            $table->unique(['translation_id', 'locale'], 'translations_trans_id_locale_unique');
            $table->foreign('translation_id' )->references('id')->on('translation__translations')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('translation__translation_translations');
    }
}

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;

class CreateTranslationTranslationTranslationsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('translation__translation_translations', function (Blueprint $table) {
            $table->engine = 'InnoDB';
            $table->increments('id');
            $table->string('value');

            $table->integer('translation_id')->unsigned();
            $table->string('locale')->index();
            $table->unique(['translation_id', 'locale'], 'translations_trans_id_locale_unique');
            $table->foreign('translation_id' )->references('id')->on('translation__translations')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('translation__translation_translations');
    }
}

--- 
+++ 
@@ -15,7 +15,7 @@
         Schema::create('translation__translation_translations', function (Blueprint $table) {
             $table->engine = 'InnoDB';
             $table->increments('id');
-            $table->string('value');
+            $table->text('value');
 
             $table->integer('translation_id')->unsigned();
             $table->string('locale')->index();
Update the column type of the value field
