Initial commit of cms and lms python, html, css and js changes

@jrbl & @stvstnfrd - making it possible to add arbitrary HTMl to course_about sidebar
The variable 'text' is defined one line above, it enables all the static text to be translated, but still build the link around and into it...and it can be reused because once it's rendered out (the line after this one runs custom_sidebar_text() ) the variable isn't needed any more.