Merge branch '5.1' into 5.x

* 5.1:
  [Process] Dont test TTY if there is no TTY support
  Fixing some Mongolian
  translating the validators for european portuguese language
  Fix CI
  Update validators.he.xlf
  Update security.he.xlf
  Update validators.he.xlf
  Improve performances in CircualReference detection
  [PHPUnitBridge] Fixed crash on Windows with PHP 8
  Fix session called initized several time

Author: nicolas-grekas

bin/simple-phpunit.php

@@ -238,7 +238,7 @@
     }
     $prevRoot = getenv('COMPOSER_ROOT_VERSION');
     putenv("COMPOSER_ROOT_VERSION=$PHPUNIT_VERSION.99");
-    $q = '\\' === \DIRECTORY_SEPARATOR ? '"' : '';
+    $q = '\\' === \DIRECTORY_SEPARATOR && \PHP_VERSION_ID < 80000 ? '"' : '';
     // --no-suggest is not in the list to keep compat with composer 1.0, which is shipped with Ubuntu 16.04LTS
     $exit = proc_close(proc_open("$q$COMPOSER install --no-dev --prefer-dist --no-progress $q", [], $p, getcwd()));
     putenv('COMPOSER_ROOT_VERSION'.(false !== $prevRoot ? '='.$prevRoot : ''));