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In MusicBrainz editing forms, there is a case guessing function that depends on the language of the content language to compel MusicBrainz capitalization style. The objective is to improve that function for the French language. If the title is Le, La, Les, L' or L' followed by only one word, that word should be capitalized (because we're sure there won't be a verb).

This task should be addressed with at least two commits:

1. Modifying the JavaScript code to implement the above improvement
2. Adding tests to check these improvements are available for such titles (and only for it) in French (and only in it)