en to en translation catalogue (2 entries)

[ctx: The label for 1 or more connected users]
en: CONNECTED_USERS | %0 connected users
en[0]: 1 connected user (me)
en[1]: %0 connected users

[ctx: The label for an alert shown when closing th editor with data not send to the server]
en: PENDING_ACTION_SENDING_DATA
en: Sending data to the server.
