The save notification message doesn't always match the current language when editing in-place

In order to reproduce you need to:

• activate multilingual with at least 2 languages supported
• create a new page (English)
• edit in-place and save: the notification message should be in English
• open the Information tab and click on the link for the missing translation
• save the missing translation: the notification message is still in English even if the current language is different