Add Arabic indicator translations to backend

[felskia]

Same image as the last but you can see with the buttons etc... Let me know if you need a translation of things.

[dereklieu]

New translation text in https://github.com/map-egypt/map-egypt.github.io/pull/349, @hagareldidi can you update them? The new items are here.

[felskia]

@dereklieu this is still an issue because it doesn't have the initial categories any more. I have the translations for them if you need them... Right now it just says other and I'm not sure where it's getting that from:

The first column on the right should be these (of course they're on the other side because this is in English :)

[dereklieu]

@felskia those initial categories aren't translated. If you select the first dropdown, you'll see where they have translated the initial categories, but not the secondary categories.

I can't make the initial translations appear if they aren't translated, so I added the "other" fall-back so they can at least see secondary translations.

There are 2 steps here to fix this:

1. Add the "other" translation in ar.yml
2. Add the indicator translations into the backend

cc @hagareldidi

[felskia]

@dereklieu we have them here though. We had already asked for them: https://docs.google.com/a/developmentseed.org/spreadsheets/d/142tBnsZO6I4B794L_QLCKsV9Bg9ESO7w2zCxldyKtL0/edit?usp=sharing

They're in the second tab.

[dereklieu]

Then there's some method to pull these translations into the back-end that hasn't been done. Not sure what that method is.

[kamicut]

I've had to re-save the data with the translations in the admin so that they get saved in the API. I am running into a rendering error on the frontend that @dereklieu is going to look into.

[dereklieu]

Rendering in #356