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https://blog.it-kb.ru/2018/11/01/how-to-fix-error-icingaexception-translator-php-cannot-set-locale-ru_ru-for-category-lc_all-in-icinga-web-2-log-on-debian-linux/
Исправление ошибок Icinga Web 2 : IcingaException Translator.php : Cannot set locale 'ru_RU' for category 'LC_ALL'