make title text size for header download (https://www.google.com/design/spec/style/typography.html#typography-styles)
make title text size for header download (https://www.google.com/design/spec/style/typography.html#typography-styles)

StepicOrg/stepik-android,StepicOrg/stepic-android,StepicOrg/stepic-android,StepicOrg/stepik-android,StepicOrg/stepik-android,StepicOrg/stepic-android