Cleanup form

- Avoid too much hidden data in the form (instead of manually define the submit button and hide the default, use the default one !)
- Fix HTML syntax in client_parameters
- Add developer link in baggy menu
- Fix space between link in material footer

src/Wallabag/CoreBundle/Form/Type/ClientType.php

@@ -15,7 +15,7 @@ class ClientType extends AbstractType
     {
         $builder
             ->add('redirect_uris', UrlType::class, array('required' => true))
-            ->add('save', SubmitType::class)
+            ->add('save', SubmitType::class, array('label' => 'Create new client'))
         ;
 
         $builder->get('redirect_uris')