update overview page copy
Make DVLA an abbreviation
Update copy on tax disc cust sat module
Update copy on SORN  cust sat module
Update application failures module copy
Ammend response time copy
Fix customer satisfaction delta position and size

- Use core-24 font mixin for font size
- Reduce the left position on small screens
Update failures copy
fix typo
Fix satisfaction typos
Make response time copy clearer
Improve failures info copy
Improve info text
Update failures copy
fiddle with failures copy
Improve vehicle licensing description
Improve table headers
Improve errors copy
Fix customer satisfaction responsiveness

Fixed vertical alignment of previous number on small screens
and positioning of arrow on intermediate screen sizes.
Minor changes with @NayeemaC