DO NOT MERGE | Fix bug 1008698 - Add source code view for original article on translation page

5 second demo - http://quick.as/bjjhmbr
My 0.02$ - 

We are using `|safe` at few places right now (all wiki pages?). If we plan to replace this template filter. Shouldn't we do that in a separate PR? 

I can remove the `|safe` in `<textarea>`, so this PR won't be adding another `|safe`.