Make seed word confirmation button font smaller

To avoid formatting glitches on some machines.

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Current Master
 
+- Decreased vault confirmation button font size to help some Linux users who could not see it.
+
 ## 2.13.2 2016-10-4
 
 - Fix bug where chosen FIAT exchange rate does no persist when switching networks

ui/app/first-time/create-vault-complete.js

@@ -61,6 +61,7 @@ CreateVaultCompleteScreen.prototype.render = function () {
         onClick: () => this.confirmSeedWords(),
         style: {
           margin: '24px',
+          fontSize: '0.9em',
         },
       }, 'I\'ve copied it somewhere safe'),
     ])