[ticket/14460] Use the selected language with AJAX requests as well

PHPBB3-14460

phpBB/phpbb/install/controller/install.php

@@ -123,6 +123,7 @@ class install
 
 		// Set the appropriate input-output handler
 		$this->installer->set_iohandler($this->iohandler_factory->get());
+		$this->controller_helper->handle_language_select();
 
 		if ($this->request->is_ajax())
 		{
@@ -142,8 +143,6 @@ class install
 			// Determine whether the installation was started or not
 			if (true)
 			{
-				$this->controller_helper->handle_language_select();
-
 				// Set active stage
 				$this->menu_provider->set_nav_property(
 					array('install', 0, 'introduction'),