Partly revert r106070 for now: Flooding of translatewiki.net log/channel:

Partly revert r106070 for now: Flooding of translatewiki.net log/channel:
PHP Notice: Use of User::getSkin was deprecated in MediaWiki 1.18. [Called from TalkpageView::show in /www/w/extensions/LiquidThreads/pages/TalkpageView.php at line 251] in /www/w/includes/GlobalFunctions.php on line 3520
PHP Notice: Use of User::getSkin was deprecated in MediaWiki 1.18. [Called from MessageTable::contents in /www/w/extensions/Translate/utils/MessageTable.php at line 98] in /www/w/includes/GlobalFunctions.php on line 3520
PHP Notice: Use of User::getSkin was deprecated in MediaWiki 1.18. [Called from TranslationHelpers::ajaxEditLink in /www/w/extensions/Translate/utils/TranslationHelpers.php at line 1186] in /www/w/includes/GlobalFunctions.php on line 3520
PHP Notice: Use of User::getSkin was deprecated in MediaWiki 1.18. [Called from ThreadPermalinkView::getSubtitle in /www/w/extensions/LiquidThreads/pages/ThreadPermalinkView.php at line 153] in /www/w/includes/GlobalFunctions.php on line 3520
and maybe more