Wrong CSS class for themes if its name includes "_" or " "
The body element in HTML has CSS classes correspond to the current theme, project, controller and action.
But "theme-*" class name is broken when the directory name of the theme includes "_" or " ". Assume that you have installed a theme whose directory name is "foo_bar". Redmine will generate a class name "theme-Foo bar". But it is clearly broken because a whitespace is used as a separater.
Here is an example.
<body class="theme-Foo bar project-ecookbook controller-issues action-index avatars-off">