Pontoon: Update German (de) localization of Nimbus Experiments

Co-authored-by: Michael Köhler <michael.koehler1@gmx.de>

Author: koehlermichael

de/subset/fx_view_discoverability_early_day_users_2024.ftl

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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+## Branch: treatment-a
+
+fx-view-discoverability-treatment-a-title = Haben Sie den gewünschten Tab nicht gefunden?
+fx-view-discoverability-treatment-a-subtitle = Durchsuchen Sie alle Ihre offenen und geschlossenen Tabs, um ihn schnell zu finden.
+
+## Branch: treatment-b
+
+
+## Branch: treatment-c
+