Version 5 0 5 4 4 12

Updating to versions 5.0.5 and 4.4.12 and minor CSS tweak.

To review:
- Check that all version numbers are correct in menus, page titles, page headers and the first two screenshots in both Getting Started and both Importing pages.
- Check version numbers on Previous page, Resources page and Home page text. 

NB: The PDF downloads from both Getting Started and both Importing pages will not be updated as these links point at the active Help site versions. Ditto the archived current and previous versions accessed from Previous and Resources pages. These will all be reviewed separately.