String resource tidy up

* Add info about installing KVM to use migrations commands to Database Error Page
* Removing 'refresh the page' <a> which was broken as it doesn't work with post requests
* Fixing typos (all strings run thru spell check - thought I had done this but evidently not)
* Fixing package description for SQL Server package
This change was missed when the bulk renames were done but didn't fail because the generated code file was updated rather than being regenerated. Needed to update this time as I regenerated based on cshtml.