Add beta to the course4 box at studio.code.org.

Also properly loc the 'beta' string, and add some space for extra line of text for some locs.
Tested with extra long strings for header; they will ellipsis correctly for both beta & non-beta courses.
Hm, if you don't have a script object you can't use beta?, but if you want to avoid duplicating the logic you could implement a class method (Script.beta?) which the instance method (ie. @script.beta? or script.beta?) can also call.