Rename language_manager() to language() and related cleanup

Thanks!

+++ b/core/includes/bootstrap.inc
@@ -2619,56 +2620,61 @@ function drupal_language_initialize() {
+  // We don't use drupal_static() here because resetting is not a simple case of
+  // drupal_static_reset().
+  static $languages = array();

I still have no idea how and where this static is reset for test runs... unless I'm mistaken, the languages are massively leaking into tests right now.

+++ b/core/includes/bootstrap.inc
@@ -2619,56 +2620,61 @@ function drupal_language_initialize() {
+  // When the language_manager service exists (is both defined and the 'request'
+  // scope is active in the container), use it to get the language. Otherwise
+  // return the default language.
+  try {
+    $language_manager = drupal_container()->get('language_manager', Container::NULL_ON_INVALID_REFERENCE);
   }

I also do not understand why we don't simply have a NonRequestContainer or HeadlessContainer, instead of those hard-coded lines in drupal_container(), and instead of this procedural language() helper.

But anyway, this patch is a good clean-up on its own, which simplifies and clarifies that current workaround.

Committed to 8.x. Thanks.

Okay, then THIS can be the issue to fix the language docs on http://drupal.org/node/1539454

I updated this myself.
This would have been enough for us to know how to update Views, which should be enough.