A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: SELECT tmi_value FROM `lu_translate_messageindex` WHERE tmi_key = '8:addsection-preload' LIMIT 1
Function: DatabaseMessageIndex::get
Error: 1146 Table 'lu_wiki.lu_translate_messageindex' doesn't exist (localhost)