Update en.json

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/locales/en.json

@@ -1381,8 +1381,6 @@
   "sw.state.unknown": "Unknown",
   "sw.state.waiting": "Waiting",
   "sw.status": "Status",
-  "sw.update": "Update",
-  "sw.update_text": "An update is available.",
   "sw.url": "Script URL",
   "tabs_bar.all": "All",
   "tabs_bar.dashboard": "Dashboard",