[DOCS] Page tree filter: add note about translated pages (#240)

* [DOCS] Page tree filter: add note about translated pages

Fixes: #239

* [TASK] Language checks

---------

Co-authored-by: Sarah McCarthy <sarahmccarthy123@yahoo.com>

Author: josefglatz

Documentation/Pages/WorkingWithPages/Index.rst

@@ -88,4 +88,9 @@ separating them with a comma.
    :alt: Filtering pages in the page tree
    :class: with-border
 
-   Filtering pages in the page tree
+Filtering pages in the page tree
+
+..  note::
+    Since TYPO3 v14, translated pages are also included in the search when
+    filtering. See :issue:`107961` for details.
+