Added jQuery browser check for ODT and Skillport eLearning

I noticed a mac user getting frustrated when trying to log in to the eLearning site the other day.
The log in process was hung up on the loading screen for a few minutes:

I pointed out that it said ‘click here’ if it doesn’t load after 40 seconds but I realize that’s not very helpful.
It turns out they were using Firefox, which isn’t one of the supported browsers.

We do have the browser compatibility information on the page but that content is collapsed. So the user would have to look for it.
So I decided to add some browser compatibility tests and display a message to mac / firefox users to save them some trouble.
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