Video (6.x-3.7) - en to cy translation catalogue (7 entries)

en: Delete
cy: Dileu

en: Preview
cy: Rhagolwg

en: Save
cy: Cadw

en: Advanced settings
cy: Gosodiadau uwch

en: 1 day | @count days
cy[0]: 1 diwrnod

en: 1 year | @count years
cy[0]: 1 flwyddyn

en: 1 week | @count weeks
cy[0]: 1 wythnos @count wythnos
