Update error messages in field formatter when no Responsive Image Style available

By this patch we can able to get user on add responsive image style page as per shown in issue image .

.

1. +++ b/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
   @@ -41,6 +44,9 @@ class ResponsiveImageFormatter extends ImageFormatterBase implements ContainerFa
   +  ¶
   

   Extra spaces should be removed from this line.

2. +++ b/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
   @@ -130,6 +140,10 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
   +          '#markup' => $this->linkGenerator->generate($this->t('Configure Image Styles'), new Url('entity.responsive_image_style.collection')),
   

   This should probably be "Configure responsive image styles", right?

3. +++ b/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
   @@ -130,6 +140,10 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
   +          '#access' => $this->currentUser->hasPermission('Administer Image Styles')
   

   Is there a separate permission for administering responsive image styles?

This would be a nice UX improvement. Good find.

Hey mdrummond it's been fixed you can check into my patch.

Patch looks good, 1 & 2 are default core behavior, so should not be changed in this issue, 2 is default as well, it links to the form element that caused the error.

Not sure if we need tests for this, personally I think it is fine without tests.

This is now just a usability improvement which are permitted during beta. Committed cdbdc4d and pushed to 8.0.x. Thanks!