Remove preview button

The preview button is a nice addition to the confirmation email template, but it's currently not part of the Jira ticket spec.

MAILPOET-4649

mailpoet/assets/js/src/newsletter_editor/components/save.js

@@ -646,18 +646,6 @@ Module.NewsletterPreviewView = Marionette.View.extend({
       return false;
     }
 
-    // don't send preview if activation_link is missing
-    if (
-      App.getConfig().get('validation.validateActivationLinkIsPresent') &&
-      $('.mailpoet_save_button').hasClass('button-disabled')
-    ) {
-      MailPoet.Notice.error(MailPoet.I18n.t('activationLinkIsMissing'), {
-        positionAfter: $emailField,
-        scroll: true,
-      });
-      return false;
-    }
-
     this.model.set('previewSendingError', false);
     this.model.set('previewSendingSuccess', false);
     this.model.set('sendingPreview', true);

mailpoet/views/newsletter/templates/components/save.hbs

@@ -22,7 +22,6 @@
     <input type="button" name="save" value="<%= __('Save') %>" class="button button-primary mailpoet_save_go_to_automation mailpoet_hidden" />
 {{else if isConfirmationEmailTemplate}}
   <div class="mailpoet_editor_confirmation_email_section">
-    <input type="button" name="preview" class="button mailpoet_show_preview" value="<%= __('Preview') %>" />
     <div class="mailpoet_save_button_group">
       <input type="button" name="save" value="<%= __('Save') %>" class="button button-primary mailpoet_save_button" />
     </div>