MT#58591 Fix 'Subscriber' tranlation in German

The correct translation is 'Teilnehmer'

Change-Id: I9c8977030267064d27143aa698c7d31d1cb87aef
(cherry picked from commit 1f3fb416fb)

src/i18n/de.json

@@ -464,9 +464,9 @@
     "Station name": "Stations-Name",
     "Status": "Status",
     "Su": "So",
-    "Subscriber": "Subscriber",
-    "Subscriber Phonebook": "Subscriber-Telefonbuch",
-    "Subscriber Sign In": "Subscriber-Anmeldung",
+    "Subscriber": "Teilnehmer",
+    "Subscriber Phonebook": "Teilnehmer-Telefonbuch",
+    "Subscriber Sign In": "Teilnehmer-Anmeldung",
     "Sunday": "Sonntag",
     "Super": "Hoch",
     "T38": "T38",