German translation for Pipeline Schedules List Page

Internationalise Pipeline Schedules List Page (#33947 (closed))

As part of our on-going effort to internationalise GitLab (#4012 (moved))

• German
  • Header message
  • All - Active - Inactive tabs
  • New schedule button
  • Table header
  • Table content
  • Edit - Delete button tooltips
  • Delete confirmation popup message