- capitalize type attribute for datacite standard

- DatasetExtension filter persons

database/migrations/2019_08_28_094055_create_persons_table.php

@@ -27,7 +27,7 @@ class CreatePersonsTable extends Migration
             $table->string('identifier_misc', 50)->nullable();
             $table->boolean('status')->nullable()->default(1);
             $table->integer('registered_at')->nullable();
-            $table->string('name_type', 50)->nullable();
+            $table->enum('name_type', ['author', 'contributor', 'other'])->nullable();
         });
 
         Schema::create('link_documents_persons', function (Blueprint $table) {

database/migrations/2019_08_29_075029_create_dataset_titles_table.php

@@ -20,7 +20,7 @@ class CreateDatasetTitlesTable extends Migration
             $table->foreign('document_id')->references('id')->on('documents')
                 ->onUpdate('cascade')->onDelete('cascade');
 
-            $table->enum('type', ['main' => 'main', 'sub' => 'sub', 'alternative' => 'alternative', 'translated' => 'translated', 'other' => 'other']);
+            $table->enum('type', ['main' => 'Main', 'sub' => 'sub', 'Alternative' => 'alternative', 'translated' => 'Translated', 'other' => 'Other']);
             $table->string('value', 255);
             $table->string('language', 3);
         });

database/migrations/2019_08_29_075729_create_dataset_abstracts_table.php

@@ -22,7 +22,7 @@ class CreateDatasetAbstractsTable extends Migration
 
             $table->enum(
                 'type',
-                ['abstract' => 'abstract', 'methods' => 'methods', 'series_information' => 'series_information', 'technical_info' => 'technical_info', 'translated' => 'translated', 'other' => 'other']
+                ['abstract' => 'Abstract', 'methods' => 'Methods', 'series_information' => 'Series_information', 'technical_info' => 'Technical_info', 'translated' => 'Translated', 'other' => 'Other']
             );
             $table->string('value', 255);
             $table->string('language', 3);