Try waiting a few minutes and reloading.
(Cannot access the database)
Backtrace:
#0 /app/includes/libs/rdbms/loadbalancer/LoadBalancer.php(972): Wikimedia\Rdbms\LoadBalancer->reportConnectionError() #1 /app/includes/libs/rdbms/loadbalancer/LoadBalancer.php(944): Wikimedia\Rdbms\LoadBalancer->getServerConnection() #2 /app/includes/libs/rdbms/database/DBConnRef.php(95): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal() #3 /app/includes/libs/rdbms/database/DBConnRef.php(101): Wikimedia\Rdbms\DBConnRef->ensureConnection() #4 /app/includes/libs/rdbms/database/DBConnRef.php(516): Wikimedia\Rdbms\DBConnRef->__call() #5 /app/includes/language/MessageCache.php(574): Wikimedia\Rdbms\DBConnRef->anyString() #6 /app/includes/language/MessageCache.php(481): MessageCache->loadFromDB() #7 /app/includes/language/MessageCache.php(398): MessageCache->loadFromDBWithMainLock() #8 /app/includes/language/MessageCache.php(318): MessageCache->loadUnguarded() #9 /app/includes/language/MessageCache.php(1213): MessageCache->load() #10 /app/includes/language/MessageCache.php(1126): MessageCache->getMsgFromNamespace() #11 /app/includes/language/MessageCache.php(1097): MessageCache->getMessageForLang() #12 /app/includes/language/MessageCache.php(1039): MessageCache->getMessageFromFallbackChain() #13 /app/includes/language/Message.php(1473): MessageCache->get() #14 /app/includes/language/Message.php(1122): Message->fetchMessage() #15 /app/extensions/CirrusSearch/includes/Hooks.php(204): Message->isDisabled() #16 /app/includes/libs/objectcache/BagOStuff.php(216): CirrusSearch\Hooks::CirrusSearch\{closure}() #17 /app/extensions/CirrusSearch/includes/Hooks.php(208): BagOStuff->getWithSetCallback() #18 /app/extensions/CirrusSearch/includes/Hooks.php(104): CirrusSearch\Hooks::overrideMoreLikeThisOptionsFromMessage() #19 /app/extensions/CirrusSearch/includes/Hooks.php(76): CirrusSearch\Hooks::initializeForRequest() #20 /app/includes/HookContainer/HookContainer.php(338): CirrusSearch\Hooks::onBeforeInitialize() #21 /app/includes/HookContainer/HookContainer.php(137): MediaWiki\HookContainer\HookContainer->callLegacyHook() #22 /app/includes/HookContainer/HookRunner.php(938): MediaWiki\HookContainer\HookContainer->run() #23 /app/includes/MediaWiki.php(208): MediaWiki\HookContainer\HookRunner->onBeforeInitialize() #24 /app/includes/MediaWiki.php(904): MediaWiki->performRequest() #25 /app/includes/MediaWiki.php(562): MediaWiki->main() #26 /app/index.php(50): MediaWiki->run() #27 /app/index.php(46): wfIndexMain() #28 {main}