[FEATURE] Allow adding inline language domains to JavaScript #1530 (#6368)

* [FEATURE] Allow adding inline language domains to JavaScript #1530

Resolves: TYPO3-Documentation/Changelog-To-Doc#1530
Releases: main

* [TASK] Fix cgl

Releases: main

* Update Documentation/ApiOverview/Backend/BroadcastChannels.rst

Co-authored-by: Chris Müller <2566282+brotkrueml@users.noreply.github.com>

* Apply suggestions from code review

---------

Co-authored-by: Lina Wolf <48202465+linawolf@users.noreply.github.com>
Co-authored-by: Chris Müller <2566282+brotkrueml@users.noreply.github.com>

Author: 3 people

Documentation/ApiOverview/Backend/BroadcastChannels.rst

@@ -75,6 +75,14 @@ Example code:
 ..  literalinclude:: _BroadcastChannels/_BackendControllerHook.php
     :caption: EXT:my_extension/Classes/Hooks/BackendControllerHook.php
 
+..  versionadded:: 14.1
+    The new method  :php:`PageRenderer->addInlineLanguageDomain()`
+    (class :php:`TYPO3\CMS\Core\Page\PageRenderer`)
+    is used to load labels from a language domain and make them available in
+    JavaScript through the :javascript:`TYPO3.lang` object. The older method
+    :php:`PageRenderer->addInlineLanguageLabelFile()` is
+    still valid for legacy, file-based labels.
+
 ..  code-block:: yaml
     :caption: EXT:my_extension/Configuration/Services.yaml
 

Documentation/ApiOverview/Backend/_BroadcastChannels/_BackendControllerHook.php

@@ -17,8 +17,8 @@ public function registerClientSideEventHandler(): void
         $this->pageRenderer->loadJavaScriptModule(
             '@myvendor/my-extension/event-handler.js',
         );
-        $this->pageRenderer->addInlineLanguageLabelFile(
-            'EXT:my_extension/Resources/Private/Language/locallang_slug_service.xlf',
+        $this->pageRenderer->addInlineLanguageDomain(
+            'my_extension.slug_service',
         );
     }
 }