Delay in loading dojos in manage dojos

[tangentfairy-zz]

It seems to take a while to load dojos on this page - can we get a ticker or something showing when I click "filter" so that I know there is something happening?

Requested by myself

[dberesford]

do you still find this slow now that we have caching in place?

[tangentfairy-zz]

@kennanseno is back on testing this afternoon and is going to look at this page in detail so he can check how slow it is

[kennanseno]

Loading the whole list of verified dojos take a long time(4+ sec average) as you can see from the screenshot below, so yea a ticker would a good way to know that it's loading.

filtered to only load verified dojos in ireland(200+) isn't as long as the one above but still takes a good while.

[tangentfairy-zz]

Technical spec
At a glance I'd imagine you could add this here https://github.com/CoderDojo/cp-zen-platform/blob/master/web/public/js/controllers/manage-dojo-controller.js#L75
Example of where a loading animation is used in the codebase: https://github.com/CoderDojo/cp-zen-platform/search?utf8=%E2%9C%93&q=spinner