Refactor map.html to use as little templating logic in the JS part as possible

[4lm]

This commit replaced some JavaScript (JS) logic with the Django templating logic from a previous code state. It was a quick, working solution, which didn't change the end result, but recoupled the Django templating logic with the JS code: b7f6c9d

As @nesnoj noted should we refactor map.html to use as little templating logic in the JS part as possible and take the already done work in this area as an guide.

Should be done in a few others, which we don't have time to spend right now.