Fix Bug #949510 - Add save buttons to bottom of page

Added copies of save/edit/discard etc. buttons to bottom of the page between review and attachments.

Made the buttons position:static so they wrap on mobile devices. Tweaked positioning of attachments add button to look good next to page buttons.
Now without merge conflicts with tracking.

Refactored to make page buttons into a macro.
Fixing positioning of bottom buttons on translate page
Merge pull request #2507 from stephaniehobson/BUG-949510-save-at-bottom

Fix Bug #949510 - Add save buttons to bottom of page