I have upgraded to mediawiki 1.26.2
I'm seeing this issue
Warning: OutputPage::getModuleStyles: style module should define its position explicitly: ext.Lingo.Styles ResourceLoaderFileModule [Called from OutputPage::getModuleStyles in /app/mediawiki/mw/includes/OutputPage.php at line 623] in/app/mediawiki/mw/includes/debug/MWDebug.php on line 300