"Edit this page" links no longer working

[krumware]

The "Edit this page" links are no longer working, likely due to some of the recent restructure.

Steps to replicate:

1. Navigate to any page on the Tag App Delivery website.
2. Click "Edit this page"
3. Results in a 404 on github

[abangser]

I wonder if this was caused by the work in #625 (FYI - @lianmakesthings) and/or if @cjyabraham has seen something like this before?

[lianmakesthings]

I think this is due to the multi-language support, as the content is now under content/language code/filename, but the link points to content/filename
I suspect this will require a bigger fix that we'd really need to think about, as we are also duplicating some pages into other languages etc.

[lianmakesthings]

From #639

The problem is, the duplicated page itself doesn't know it's duplicated. I didn't want to make it too complex, that's why the duplication happens during build, and not before.
I'm thinking about what the expected behaviour should be for those cases. The issue happens, when I'm on a non-default language page that has been duplicated. So if I'm clicking edit, do I want to add a translation or do I want to edit the English page? I'd argue both are likely expectations, so it's tough to say what the fix should be.