Fix wording an -> one

Review Request #128652 - Created Aug. 10, 2016 and submitted - Latest diff uploaded

Information
Burkhard Lück
kwallet
Reviewers
kdeframeworks, kdeutils
rthomsen, vrusu

Change "Please set-up at least an encryption key" to "Please set-up at least one encryption key" as requested in RR https://git.reviewboard.kde.org/r/128378/

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