Document Crowdin configuration for site settings

Documentation/ApiOverview/Localization/TranslationServer/Crowdin/ExtensionIntegration.rst

@@ -67,6 +67,30 @@ Step-by-step instructions for GitHub
             ignore:
               - /**/%two_letters_code%.%original_file_name%
 
+    If you provide a :file:`labels.xlf` file for the
+    :ref:`site settings <site-settings-definition-translation>`,
+    the `/Configuration/Sets/` folder should be added:
+
+    ..  code-block:: yaml
+        :caption: EXT:my_extension/.crowdin.yml
+
+        preserve_hierarchy: 1
+        files:
+          - source: /Configuration/Sets/*/*.xlf
+            translation: /%original_path%/%two_letters_code%.%original_file_name%
+            ignore:
+              - /**/%two_letters_code%.%original_file_name%
+          - source: /Resources/Private/Language/*.xlf
+            translation: /%original_path%/%two_letters_code%.%original_file_name%
+            ignore:
+              - /**/%two_letters_code%.%original_file_name%
+
+    ..  note::
+        If you use the configuration with the :file:`/Configuration/Sets/*/*.xlf`
+        source and do not provide labels, the GitHub action returns an error.
+        However, your files from the :file:`/Resources/Private/Language/` folder
+        will still be uploaded.
+
 2.  Connect your GitHub repository
 
     In order for Crowdin to manage translations, you need to somehow push the

Documentation/ApiOverview/SiteHandling/SiteSettingDefinitions.rst

@@ -292,6 +292,11 @@ For example, the label of the setting is simply `label` in the XLF file.
         <source>My Custom Set</source>
     </trans-unit>
 
+..  important::
+    To translate the labels of your settings using Crowdin, you need to adjust
+    your extension's
+    :ref:`Crowdin configuration file <crowdin-extension-integration-github-configure>`.
+
 ..  _site-settings-definition-translation-category:
 
 Translating category labels