Updated references to qa-mono-multilingual to match the new French tr…

[clavoline]

As explained in an email about the new French translation of questions/qa-mono-multilingual:

This article's title and two of its headings were translated in "questions/qa-when-lang-neg.fr". However, I didn't keep these prior translations:

• Instead of "Les sites web unilingues et multilingues", I chose "Sites Web unilingues et multilingues" for consistency with another article called "Sites Web internationaux et multilingues".
• Instead of "Multilingue, même contenu", I chose "Site multilingue, même contenu".
• Instead of "Multilingue, contenu changé", I chose "Site multilingue, contenu différent".

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[r12a]

Excellent. Merci bien !