PIM-1759: Reduce font-size of buttons

Bug fix: [no]
Feature addition: [no]
Backwards compatibility break: [no]
Unit test passes: [yes]
Specs passes: [yes]
Replaced unit test classes removed: [no]
Behat scenario passes: [yes|no]
Checkstyle issues: [no]*
ChangeLog updated: [no]
Fixes the following jira:
 - PIM-1759
 - PIM-1760