Post Toolbar Options - Timestamp?

Just a quick question to re-open this if I may…

I spotted that when this was being used the time stamp was quite long, looking at the various options using JavaScript to shorten the date it seemed incredibly complex, from what I could tell the desired output would always be 21 characters long so went with a bit of a hacky way of doing this…

<script type="text/discourse-plugin" version="0.4">
    api.onToolbarCreate(toolbar => {
      toolbar.addButton({
        id: "updated_button",
        group: "extras",
        icon: "clock-o",
        perform: e => e.addText("_Updated " + new Date().toString().substring(0,21) + "_")
      });
    });
</script>

I then spotted that the hover text didn’t display a name correctly - so we have added this

title: "Updated Timestamp",

thus;

<script type="text/discourse-plugin" version="0.4">
    api.onToolbarCreate(toolbar => {
      toolbar.addButton({
        id: "updated_button",
        group: "extras",
        icon: "clock-o",
        title: "Updated Timestamp",
        perform: e => e.addText("_Updated " + new Date().toString().substring(0,21) + "_")
      });
    });
</script>

but the output in the hover text appears as [en.Updated Timestamp]

Anyway to remove the square brackets and the en. part?