Improve Carer's Allowance module titles and URLs
Standardise URLs and titles on FCO dashboards
Correctly sentence case Carer's linelabel

Because @annapowellsmith has awesome attention to detail skillz :)
Change performance to dashboard on new dashboard

In line with #181.
Fix GOV.UK dashboard breadcrumb slug
'Performance' to 'dashboard' again
Carers - change 'non-digital' to 'paper form'
Change Transactions by channel to use transaction-specific noun (payments, claims etc) eg Claims breakdown
Change 'Public purchasing dashboard' to 'Public sector purchasing dashboard'
Merge pull request #176 from alphagov/more-betterer-urls

Standardise URLs and page-per-thing titles