I thought the tweak was documented within the Preferences | Tweaks area
Quote:
Set the list of words that are to be considered 'articles' when computing the
title sort strings. The articles differ by language. By default, calibre uses
a combination of articles from English and whatever language the calibre user
interface is set to. In addition, in some contexts where the book language is
available, the language of the book is used. You can change the list of
articles for a given language or add a new language by editing
per_language_title_sort_articles. To tell calibre to use a language other
than the user interface language, set, default_language_for_title_sort. For
example, to use German, set it to 'deu'. A value of None means the user
interface language is used. The setting title_sort_articles is ignored
(present only for legacy reasons).
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So to me it says, that Calibre will use English PLUS whatever language Calibre is running in; and that you can force it to use an additional language by setting default_language_for_title_sort to (for instance) 'deu' or 'fra'.