Pass title to action=parse requests for extensions

Test case:
http://localhost:8000/frwikisource/Les_Jeux_rustiques_et_divins%2FExorde?oldid=4662317

The navigation now properly shows the prev & next page links.

Bug: 69190
Change-Id: I0dabedab8a6a38ca9e3ac750b257358de58f3440
Merge "Pass title to action=parse requests for extensions"