4.2: multilanguage: I can not change the title of the home page: Home is the default title for all languages

4.2 installation with a few couple of pages. Then I added a serie of new languages and tried to traduce my home page title. Each time I try to modify it, it comes back to "Home" (for example, I renamed it French fo the French languages, Deutsch for the german one, etc...) but for each language I still have "Home" which come back in my home page property engine.