Thread:Extension talk:Translate/Error after installing the Language Extension Bundle/reply

It looks like the "Database query error" is displayed because you did not run update.php, and that you cannot run update.php due to a different issue. I have only seen that error reported at https://gerrit.wikimedia.org/r/#/c/166705/. What version is your MediaWiki core? Can you check that you do not have CACHE_ACCEL defined in your LocalSettings.php?