Add Company VAT-ID and Tax-ID (#54)

* add company vat_id & tax_id field

* add tax & vat id field in company settings

* fix vat & tax id validation

* add german vat & tax id translation

* add translations for pdf

* add vat_id and tax_id field before timestamps

* make fields nullable and fix code style

app/Http/Requests/CompaniesRequest.php

@@ -69,6 +69,8 @@ class CompaniesRequest extends FormRequest
         return collect($this->validated())
             ->only([
                 'name',
+                'vat_id',
+                'tax_id',
             ])
             ->merge([
                 'owner_id' => $this->user()->id,