Make document filter show whole keyword string

https://www.pivotaltracker.com/story/show/61541678
Sub org layout fixes

• limit govspeak to two thirds width - better line length
• fix header layout
Merge pull request #1183 from alphagov/sub-org-layout-fixes

Sub org layout fixes

https://www.pivotaltracker.com/story/show/62833060
Merge pull request #1159 from alphagov/61541678-make-document-filter-show-whole-string

Make document filter show whole keyword string

https://www.pivotaltracker.com/story/show/61541678