I don't understand how to also change the menu items to different languages?
If this is supposed to help, it doesnt;
For titles, you have to write as normal title inside post, the one in the language you have set as default.
Then you have only to scroll till Custom Fields and add:
key: the short tag of the language ( the two first letters of the Language Code eg. de, en, fr )
value: the title text.
I can't find Custom fields anywhere. Where am I supposed to look?