diff --git a/typo3/sysext/backend/Classes/Form/Element/SelectTreeElement.php b/typo3/sysext/backend/Classes/Form/Element/SelectTreeElement.php
index a8725b9c9b04719f56c65ad4cd548e8d6ca66546..d1ae3ff5711f3a6392f2163ccbf86da0c4aebfdd 100644
--- a/typo3/sysext/backend/Classes/Form/Element/SelectTreeElement.php
+++ b/typo3/sysext/backend/Classes/Form/Element/SelectTreeElement.php
@@ -104,7 +104,7 @@ class SelectTreeElement extends AbstractFormElement
 
         // add necessary labels for tree header
         if ($showHeader) {
-            $resultArray['additionalInlineLanguageLabelFiles'][] = 'EXT:lang/locallang_csh_corebe.xlf';
+            $resultArray['additionalInlineLanguageLabelFiles'][] = 'EXT:lang/Resources/Private/Language/locallang_csh_corebe.xlf';
         }
         $resultArray['requireJsModules']['selectTreeElement'] = [
             'TYPO3/CMS/Backend/FormEngine/Element/SelectTreeElement' => 'function (SelectTreeElement) { SelectTreeElement.initialize(); }'
diff --git a/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php b/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
index 3eb14bb7c387f45056f4bf223f4f1bc051cce198..a9c6fac5a1ef453c0c3645cf3bae38c515a66987 100644
--- a/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
+++ b/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
@@ -1072,10 +1072,10 @@ class ExtensionManagementUtility
     /**
      * Adds a reference to a locallang file with $GLOBALS['TCA_DESCR'] labels
      * FOR USE IN ext_tables.php FILES
-     * eg. \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('pages', 'EXT:lang/locallang_csh_pages.xlf'); for the pages table or \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_layout', 'EXT:frontend/Resources/Private/Language/locallang_csh_weblayout.xlf'); for the Web > Page module.
+     * eg. \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('pages', 'EXT:lang/Resources/Private/Language/locallang_csh_pages.xlf'); for the pages table or \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_layout', 'EXT:frontend/Resources/Private/Language/locallang_csh_weblayout.xlf'); for the Web > Page module.
      *
      * @param string $tca_descr_key Description key. Typically a database table (like "pages") but for applications can be other strings, but prefixed with "_MOD_")
-     * @param string $file_ref File reference to locallang file, eg. "EXT:lang/locallang_csh_pages.xlf" (or ".xml")
+     * @param string $file_ref File reference to locallang file, eg. "EXT:lang/Resources/Private/Language/locallang_csh_pages.xlf" (or ".xml")
      * @return void
      */
     public static function addLLrefForTCAdescr($tca_descr_key, $file_ref)
diff --git a/typo3/sysext/core/ext_tables.php b/typo3/sysext/core/ext_tables.php
index ac2be5712f3f156a0bbae44a0a49fcfa855d8d93..026c17e827528aaeb009660c981446c9bf0a1005 100644
--- a/typo3/sysext/core/ext_tables.php
+++ b/typo3/sysext/core/ext_tables.php
@@ -94,15 +94,15 @@ $GLOBALS['TBE_STYLES'] = [];
  * For information about using the CSH API in TYPO3 you should consult the
  * documentation found in "Inside TYPO3"
  */
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('pages', 'EXT:lang/locallang_csh_pages.xlf');
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('be_users', 'EXT:lang/locallang_csh_be_users.xlf');
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('be_groups', 'EXT:lang/locallang_csh_be_groups.xlf');
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_filemounts', 'EXT:lang/locallang_csh_sysfilem.xlf');
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_language', 'EXT:lang/locallang_csh_syslang.xlf');
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_news', 'EXT:lang/locallang_csh_sysnews.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('pages', 'EXT:lang/Resources/Private/Language/locallang_csh_pages.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('be_users', 'EXT:lang/Resources/Private/Language/locallang_csh_be_users.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('be_groups', 'EXT:lang/Resources/Private/Language/locallang_csh_be_groups.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_filemounts', 'EXT:lang/Resources/Private/Language/locallang_csh_sysfilem.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_language', 'EXT:lang/Resources/Private/Language/locallang_csh_syslang.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('sys_news', 'EXT:lang/Resources/Private/Language/locallang_csh_sysnews.xlf');
 // General Core
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('xMOD_csh_corebe', 'EXT:lang/locallang_csh_corebe.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('xMOD_csh_corebe', 'EXT:lang/Resources/Private/Language/locallang_csh_corebe.xlf');
 // Web > Info
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_info', 'EXT:lang/locallang_csh_web_info.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_info', 'EXT:lang/Resources/Private/Language/locallang_csh_web_info.xlf');
 // Web > Func
-\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_func', 'EXT:lang/locallang_csh_web_func.xlf');
+\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr('_MOD_web_func', 'EXT:lang/Resources/Private/Language/locallang_csh_web_func.xlf');
diff --git a/typo3/sysext/lang/locallang_csh_be_groups.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_be_groups.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_be_groups.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_be_groups.xlf
diff --git a/typo3/sysext/lang/locallang_csh_be_users.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_be_users.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_be_users.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_be_users.xlf
diff --git a/typo3/sysext/lang/locallang_csh_corebe.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_corebe.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_corebe.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_corebe.xlf
diff --git a/typo3/sysext/lang/locallang_csh_pages.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_pages.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_pages.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_pages.xlf
diff --git a/typo3/sysext/lang/locallang_csh_sysfilem.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_sysfilem.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_sysfilem.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_sysfilem.xlf
diff --git a/typo3/sysext/lang/locallang_csh_syslang.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_syslang.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_syslang.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_syslang.xlf
diff --git a/typo3/sysext/lang/locallang_csh_sysnews.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_sysnews.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_sysnews.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_sysnews.xlf
diff --git a/typo3/sysext/lang/locallang_csh_web_func.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_web_func.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_web_func.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_web_func.xlf
diff --git a/typo3/sysext/lang/locallang_csh_web_info.xlf b/typo3/sysext/lang/Resources/Private/Language/locallang_csh_web_info.xlf
similarity index 100%
rename from typo3/sysext/lang/locallang_csh_web_info.xlf
rename to typo3/sysext/lang/Resources/Private/Language/locallang_csh_web_info.xlf