Replace remaining !placeholder for Non-URL HTML outputs only in code Table.php

There is only one usage which is:

$title = t('Update @title', array('@title' => $title));

. Triggering the tests to see what happens..

+++ b/core/lib/Drupal/Core/Render/Element/Table.php
@@ -200,7 +200,7 @@ public static function processTable(&$element, FormStateInterface $form_state, &
             if (isset($title) && $title !== '') {
-              $title = t('Update !title', array('!title' => $title));
+              $title = t('Update @title', array('@title' => $title));
             }

Does anyone know what the dickens this is doing here? It seems very strange to have this in a generic render element.

It's not part of theme_table in Drupal 7.

In was introduced in #80855: Add element #type table and merge tableselect/tabledrag into it with no apparent tests. Weird.

@dawehner given you've done the work perhaps a comment would help. I think @ is correct because auto-escape but it would be awesome to have a test.

Working on the test case

+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestTableForm.php
@@ -0,0 +1,53 @@
+        '#title' => SafeString::create('<em>flamingo</em>'),

Let's use $this->t() here... something like $this->t('My favourite fruit is <strong>@fruit</strong>', ['@fruit' => 'bananas'])

This is part of the critical meta.

Committed 55118ad and pushed to 8.0.x. Thanks!

diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestTableForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestTableForm.php
index c7fc112..1a75386 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestTableForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestTableForm.php
@@ -8,7 +8,6 @@
 namespace Drupal\form_test\Form;
 
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Render\SafeString;
 
 class FormTestTableForm extends FormTestTableSelectFormBase {
 
@@ -26,7 +25,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['table'] = [
       '#type' => 'table',
       '#tableselect' => TRUE,
-      '#empty' => t('Empty text.'),
+      '#empty' => $this->t('Empty text.'),
     ];
     $form['table']['row'] = [
       'data' => [

Fixed on commit.