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SOGo uses the name of calendar categories verbatim to construct a CSS selector without escaping characters such as "/". This patch ensures those selector names are properly escaped so calendar categories applied to a calendar event match the according selector and appear in the correct color. This patch makes use of the CSS escape API which is supported by all major browsers. See https://caniuse.com/mdn-api_css_escape. Also see https://mathiasbynens.be/notes/css-escapes.