Include link to tatoeba.org in the page layout

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Many pages of the wiki have something like "Go back to tatoeba.org" manually added in page content itself.

For instance: https://en.wiki.tatoeba.org/articles/show/faq

It's sometimes added at the top, sometimes at the bottom, sometimes both, sometimes not at all, sometimes with a different phrasing. It's very inconsistent. We should make it part of the layout.

I'm not sure what's the best way. I suggest just adding "tatoeba.org" after "Recent changes" in the menu.