Added translation for new assigning keyboard shortcut

imports/i18n/data/en.i18n.json

@@ -610,6 +610,7 @@
   "has-spenttime-cards": "Has spent time cards",
   "time": "Time",
   "title": "Title",
+  "toggle-assignees": "Toggle assignees 1-9 for card (By order of addition to board).",
   "toggle-labels": "Toggle labels 1-9 for card. Multi-Selection adds labels 1-9",
   "remove-labels-multiselect": "Multi-Selection removes labels 1-9",
   "tracking": "Tracking",