In po/fr.po:

> @@ -35,7 +35,7 @@ msgstr "N°"
>  #: ../addons/src/ao_bookmarklist.c:350 ../devhelp/src/dhp-object.c:494
>  #: ../devhelp/devhelp/dh-window.c:1142
>  msgid "Contents"
> -msgstr "Contenu"
> +msgstr "Contenus"

Doubt it's really the plural form in English, but rather the whatever-it-is-named fact this word is always plural when referring to actual stuff.
Would have to triple check in the context of the plugins, but I think singular form in French is the right choice.

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