Update en.min.js

When viewing in Text Only mode our output looks like this.  

End of this tab panel.(missing space)Return to the tab list(missing space)or continue to the rest of page.

Submitting this fix to add a couple of spaces and make this sentence work better, like this other example in this same file.

"The form could not be submitted because ","errs-fnd":" errors were found.","err-fnd":" error was found."