The latest version of Calibre changed the way titles are sorted in other languages.
Quote:
|
Change the algorithm that generates title sort strings to strip leading articles from both english and the current language set for the calibre user interface. In addition, in the edit metadata dialog, calibre will use the book's language when calculating the sort string. This behavior can be adjusted via Preferences->Tweaks.
|
Source:
http://calibre-ebook.com/whats-new
Would it be possible to let your plug-in check the title sort in languages other than English?