Correct official name of GFZ

Change the official name from "Helmholtz Centre Potsdam German Research Centre for Geosciences" to "Helmholtz Centre Potsdam German Research Centre for Geosciences GFZ" in imprint.

added In Progress label

added Effort: XS Frontend GFZ labels

assigned to @marc.hanisch

changed the description

added Acceptance label and removed In Progress label

added Testing label and removed Acceptance label

mentioned in merge request !176 (merged)

added Required: Alpha GFZ DMZ label

mentioned in commit 80505334

closed with merge request !176 (merged)