[FIX] Contact template: Use singular for heading

The column showed "Contacts". The second column reads "Ripple name" in
singular. Make first column title match second.
[TASK] History template: Drop headers

RT-2384
Remove the "filters" and "transaction history" titles.
[FIX] History template: Expand filters by default

RT-2384
Make the History filters open by default because we don't have that many
[TASK] History template: Restyle CSV Export button

RT-2384

- Make the History page's Date/Description/Export to CSV button the same
design and spacing as the Contacts page's Contacts/Ripple name or
Address/Add contact button

- Make sure that when you go between the two pages, the "Add contact"
button and "Export to CSV" button doesn't "jump" around. This means
moving the "Export to CSV" button to the right.
Merge pull request #1628 from jublonet/feature/2384-history-page-styling

[FIX] RT-2384 History template: Standardize styling