ENG locale is [hard-coded|https://github.com/xwiki/xwiki-platform/blob/70722ac119b808e972dfe33c4642b676a1df79e5/xwiki-platform-core/xwiki-platform-notifications/xwiki-platform-notifications-ui/src/main/resources/XWiki/Notifications/MailTemplate.xml#L158-L160] as property to MailTemplate page. It either can be removed or {noformat}macros.vm{noformat} can be modified with defined variable {code}$xcontext.locale{code} - this way notification mail will use the XWiki locale either it's monolingu or multilanguage.
French version of translations are present in L10n Notification: [one part|https://l10n.xwiki.org/browse/xwiki-platform/xwiki-platform-notifications/xwiki-notifications-code-translations/fr/?q=notifications.email.subject&sort_by=-priority%2Cposition&checksum=], [another part|https://l10n.xwiki.org/browse/xwiki-platform/xwiki-platform-notifications/xwiki-notifications-code-translations/fr/?q=notifications.events.&sort_by=-priority%2Cposition&checksum=].
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