ACP2E-537: Unable to use "Translate inline" on the same element second time

- fix static failure
- fix unit test

Author: o-dubovyk

app/code/Magento/Backend/Controller/Adminhtml/Ajax/Translate.php

@@ -6,9 +6,10 @@
  */
 namespace Magento\Backend\Controller\Adminhtml\Ajax;
 
+use Magento\Framework\App\Action\HttpPostActionInterface;
 use Magento\Backend\App\Action;
 
-class Translate extends \Magento\Backend\App\Action
+class Translate extends \Magento\Backend\App\Action implements HttpPostActionInterface
 {
     /**
      * @var \Magento\Framework\Translate\Inline\ParserInterface
@@ -23,7 +24,7 @@ class Translate extends \Magento\Backend\App\Action
     /**
      * Authorization level of a basic admin session
      */
-    const ADMIN_RESOURCE = 'Magento_Backend::content_translation';
+    public const ADMIN_RESOURCE = 'Magento_Backend::content_translation';
 
     /**
      * @param Action\Context $context

lib/internal/Magento/Framework/Phrase/Test/Unit/Renderer/TranslateTest.php

@@ -7,6 +7,7 @@
 
 namespace Magento\Framework\Phrase\Test\Unit\Renderer;
 
+use Magento\Framework\Phrase\Renderer\MessageFormatter;
 use Magento\Framework\Phrase\Renderer\Translate as PhraseRenderer;
 use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
 use Magento\Framework\Translate;
@@ -32,18 +33,32 @@ class TranslateTest extends TestCase
      */
     protected $loggerMock;
 
+    /**
+     * @var MessageFormatter|MockObject
+     */
+    private $messageFormatter;
+
     protected function setUp(): void
     {
         $this->_translator = $this->getMockForAbstractClass(TranslateInterface::class);
         $this->loggerMock = $this->getMockBuilder(LoggerInterface::class)
             ->getMock();
+        $this->messageFormatter = $this->getMockBuilder(MessageFormatter::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+        $this->messageFormatter
+            ->method('render')
+            ->willReturnCallback(function($source) {
+                return end($source);
+            });
 
         $objectManagerHelper = new ObjectManager($this);
         $this->_renderer = $objectManagerHelper->getObject(
             PhraseRenderer::class,
             [
                 'translator' => $this->_translator,
-                'logger' => $this->loggerMock
+                'logger' => $this->loggerMock,
+                'messageFormatter' => $this->messageFormatter,
             ]
         );
     }
@@ -96,7 +111,8 @@ public function testRenderException()
     {
         $message = 'something went wrong';
         $exception = new \Exception($message);
-
+        $this->messageFormatter->expects($this->never())
+            ->method('render');
         $this->_translator->expects($this->once())
             ->method('getData')
             ->willThrowException($exception);