*9037* Show titles in TOC as configured in manager/languages

A very few modifications in core to get more control about how language is shown in TOC in multilang journals.
The aim of the modifications was commented here:
http://pkp.sfu.ca/support/forum/viewtopic.php?f=9&t=13021&p=49967
The new feature requires also requires modifications submitted to "ojs" repository.

It would be nice if this logic could be implemented just once, instead of once in Submission and once in AppLocale. AppLocale is not a terrible place to put it, since it's independent of both Submission and ArticleGalley.