[ticket/11088] Move style, extension and language pack management to customise

Instead of being separated, these related ACP modules are now grouped
intuitively.

PHPBB3-11088

phpBB/install/database_update.php

@@ -2489,6 +2489,20 @@ function change_database_data(&$no_updates, $version)
 					'auth'		=> 'acl_a_styles',
 					'cat'		=> 'ACP_STYLE_MANAGEMENT',
 				),
+				'extensions'	=> array(
+					'base'		=> 'acp_extensions',
+					'class'		=> 'acp',
+					'title'		=> 'ACP_EXTENSIONS',
+					'auth'		=> 'acl_a_extensions',
+					'cat'		=> 'ACP_EXTENSION_MANAGEMENT',
+				),
+				'lang_management'	=> array(
+					'base'		=> 'acp_language',
+					'class'		=> 'acp',
+					'title'		=> 'ACL_LANGUAGE_PACKS',
+					'auth'		=> 'acl_a_language',
+					'cat'		=> 'ACL_LANGUAGE',
+				),
 				'autologin_keys'	=> array(
 					'base'		=> 'ucp_profile',
 					'class'		=> 'ucp',

phpBB/install/install_install.php

@@ -2095,9 +2095,10 @@ class install_install extends module
 				'ACP_PERMISSION_ROLES',
 				'ACP_PERMISSION_MASKS',
 			),
-			'ACP_CAT_STYLES'		=> array(
+			'ACP_CAT_CUSTOMISE'		=> array(
 				'ACP_STYLE_MANAGEMENT',
-				'ACP_STYLE_COMPONENTS',
+				'ACP_EXTENSIONS_MANAGEMENT',
+				'ACP_LANGUAGE'
 			),
 			'ACP_CAT_MAINTENANCE'	=> array(
 				'ACP_FORUM_LOGS',