Update BookStack to 21.08.3
Fixed certain "Custom HTML Head Content" being incorrectly altered or converted. (#2923, #2914)
Updated translations with latest Crowdin updates. (#2915)
This app packages BookStack version
BookStack is an opinionated wiki system that provides a pleasant and simple out of the box experience. New users to an instance should find the experience intuitive and only basic word-processing skills should be required to get involved in creating content on BookStack.