Updated translations.

imports/i18n/data/en.i18n.json

@@ -1245,5 +1245,6 @@
   "show-at-minicard": "Show at minicard",
   "show-checklist-at-minicard": "Show checklist at minicard",
   "show-subtasks-field": "Show subtasks field",
-  "convert-to-markdown": "Convert to markdown"
+  "convert-to-markdown": "Convert to markdown",
+  "import-board-zip": "Add .zip file that has board JSON files, and board name subdirectories with attachments"
 }