To copy a version of an item from one language to another:

1. Open the item you want to copy a version of

2. Right-click on the parent item/module that you want to add a version of

3. Click Copying > Add Version And Copy

4. Select the source language that you want the item/module to be copied from and tick the languages you want the item/module to be copied to from the window

Include subitems if you are adding a version of a whole page to another language from the parent item

5. Select 'Add Version and Copy'