Fixed Incorrect page when delete a phrase on ACP

Affected version
2.0 final

When i delete a custom pharse, a possible incorrect page appear.

Steps reproduce:

Create a custom phrase and click on 'Save' button. Don't click on Save and Exit

Now, click on "Revert" button (top corner right) and confirm the action.

And now, appear a page that said:
'Oops! We ran into some problems. The requested page could not be found.'

Maybe the correct thing would be to return to the list of phrases.