v1.0.0-prerelease.19

Changlog

• 00389c2 adding type="button" to the button in the header (#474)
• ddd6779 Pfe-tabs - add centered alignment (#467)
• 356079f Update CHANGELOG-prerelease.md (#472)
• 5d4752d dev-pull-request-template add testing instructions to PR template (#463)