Fix Call to undefined function Magento\Ui\Controller\Adminhtml\Index\_()

[centerax]

A call on file app/code/Magento/Ui/Controller/Adminhtml/Index/Render.php to the translation logic is using one underscore when the function should be called with two. This breaks test Magento\Ui\Test\Unit\Controller\Adminhtml\Index\RenderTest::testExecuteAjaxRequestException

1) Magento\Ui\Test\Unit\Controller\Adminhtml\Index\RenderTest::testExecuteAjaxRequestException Error: Call to undefined function Magento\Ui\Controller\Adminhtml\Index_()

/var/builds/magento2/app/code/Magento/Ui/Controller/Adminhtml/Index/Render.php:103 /var/builds/magento2/app/code/Magento/Ui/Controller/Adminhtml/AbstractAction.php:62 /var/builds/magento2/app/code/Magento/Ui/Test/Unit/Controller/Adminhtml/Index/RenderTest.php:238

Contribution checklist

• [ ] Pull request has a meaningful description of its purpose
• [ ] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with unit/integration tests (if applicable)
• [ ] All automated tests passed successfully (all builds on Travis CI are green)

[centerax]

not sure if it can be merged as it is @buskamuza because of another failing test.

looking forward to your feedback

[bbatsche]

I think it's safe to say those failure are unrelated to your change; this PR should still be safe to merge

[centerax]

I agree, thanks.