Add show week of year translation

imports/i18n/data/en.i18n.json

@@ -1256,6 +1256,7 @@
   "text": "Text",
   "translation-text": "Translation text",
   "show-subtasks-field": "Show subtasks field",
+  "show-week-of-year": "Show week of year (ISO 8601)",
   "convert-to-markdown": "Convert to markdown",
   "import-board-zip": "Add .zip file that has board JSON files, and board name subdirectories with attachments",
   "collapse": "Collapse",