[#1510] Fix typo on /request/upload_response

Fixes #1510 

This fixes a typo which cased the following to be displayed when
uploading a response:

    Respond to the FOI request 'FOI Request'FOI User

It now says (correctly):

    Respond to the FOI request 'FOI Request' made by FOI User

Thanks to @brfairless for the original implementation of this commit.