Don't "fix" empty homepage URLs

Leaving the homepage field empty on the profile page causes `http://` to be saved instead.
Wording

Mehr ausführlich und so.
Merge pull request #282 from thegcat/patch-1

Don't "fix" empty homepage URLs
Merge pull request #283 from thegcat/patch-2

Wording
Removed KDDK … gone it is :wink: #261
Merge branch 'master' of github.com:hcking/hcking
Merge branch 'master' into external-user-participation