Update translations (de)

i18n/de.i18n.json

@@ -100,7 +100,7 @@
     "boardMenuPopup-title": "Boardmenü",
     "boards": "Boards",
     "board-view": "Boardansicht",
-    "board-view-cal": "Calendar",
+    "board-view-cal": "Kalender",
     "board-view-swimlanes": "Swimlanes",
     "board-view-lists": "Listen",
     "bucket-example": "z.B. \"Löffelliste\"",