refs #15507 [fid] set return url for back button

* get referer url from request
* check for lightbox in templates

module/fid/src/Controller/UserController.php

@@ -218,6 +218,10 @@ class UserController extends AbstractBase
         $viewModel = $this->createViewModel();
         $viewModel->setTemplate('fid/user/policy');
 
+        if (isset($_REQUEST['lbreferer'])) {
+            $viewModel->setVariable('backUrl', $_REQUEST['lbreferer']);
+        }
+
         return $viewModel;
     }
 
@@ -226,6 +230,10 @@ class UserController extends AbstractBase
         $viewModel = $this->createViewModel();
         $viewModel->setTemplate('fid/user/terms');
 
+        if (isset($_REQUEST['lbreferer'])) {
+            $viewModel->setVariable('backUrl', $_REQUEST['lbreferer']);
+        }
+
         return $viewModel;
     }
 

themes/fid/templates/fid/user/policy.phtml

 <!-- fid - policy begin -->
 <? $lang = $this->layout()->userLang; ?>
-<?php if ($this->layout()->getTemplate() == 'layout/lightbox'): ?>
+<?php if (isset($backUrl) && $this->layout()->getTemplate() == 'layout/lightbox'): ?>
     <div class="form-group">
-        <a class="back-to-login btn btn-link" href="<?=$this->url('myresearch-account') ?>">
+        <a class="back-to-login btn btn-link" href="<?= $backUrl?>">
             <i class="fa fa-chevron-left" aria-hidden="true"></i>
             <?=$this->transEsc('Back')?>
         </a>

themes/fid/templates/fid/user/terms.phtml

 <!-- fid - terms begin -->
 <? $lang = $this->layout()->userLang; ?>
 <? $fileExists = file_exists(dirname(__FILE__) . '/terms-'.$lang.'.phtml'); ?>
-<?php if ($this->layout()->getTemplate() == 'layout/lightbox'): ?>
+<?php if (isset($backUrl) && $this->layout()->getTemplate() == 'layout/lightbox'): ?>
     <div class="form-group">
-        <a class="back-to-login btn btn-link" href="<?=$this->url('myresearch-account') ?>">
+        <a class="back-to-login btn btn-link" href="<?= $backUrl?>">
             <i class="fa fa-chevron-left" aria-hidden="true"></i>
             <?=$this->transEsc('Back')?>
         </a>