Waaaahhhhhh I don't know how to use dokuwiki!!! Cmon, like you really understood the mediawiki markup? Grow up. https://www.dokuwiki.org/wiki:syntax
Non Breaking Spaces - We have a plugin installed that allows you to create a nbsp;. But don't use html syntax for it, dummy. Instead you need to type a backslash followed by a space, like this: “<html>\</html> ”
Gallery Plugin - This is installed and available. Learn how to use it. https://www.dokuwiki.org/plugin:gallery