Validating dynamic data (inputs)

im creating a multilanguage app, and in it i have a table that stores the information of products in different languages.

My db Structure is:

Languages:
- id;
- name;
- iso;
ex: 1, english, en | 2, spanish, es

Products:
- id;
- category_id;
- online;
- price;

Products_Translations:
- id;
- product_id;
- name;
- description;
- language_id;

Busically based in this structure i cant manage the languages that exist on my app.

So basically in my view edit page i have something like this:

 @foreach($languages as $language)
                                <h4></h4>
                                <div class="form-group">
                                    <label for="category">Titlle</label>
                                    <input type="text" class="form-control" required="" name="name_" id="name" placeholder="Título ">
                                </div>


                                <div class="form-group">
                                    <label for="category">Description</label>
                                   <textarea class="form-control" required name="description_" rows="5"></textarea>
                                </div>
                                <hr>

@endforeach 

So after submmitting the data in my "$request->all()" i get something like:

array:7 [▼
  "_token" => "8EVkeyHkAggV9sd2eEMUpclryDM1BB1Yh6J3Xs8R"
  "name_en" => "Title EN"
  "description_en" => "deacriao en"
  "name_es" => "title PT"
  "description_es" => "descriapo ES"
]

How i would validate dynamic content in my controller?

I know that the only dynamic content i have of inputs fields would be the 'name' and 'description' on products_translated' table, so maybe i would first get all my languages and loop and build these fields based on what i would receive on the request, but how i would implement it in the $request data?

$languages = Language::all();


        $this->validate($request, array(
            'title_'         => 'required|min:2'
...
        ));

via Pedro