Normalized sentence() in sentences.contribute.js, so that new sentences also get their tab and new lines removed.
Normalized sentence() in sentences.contribute.js, so that new sentences also get their tab and new lines removed.

git-svn-id: 776ea4b3e47339c5b8782ec5e9346c740e073fb4@1892 e0e46c49-be69-4f5a-ad62-21024a331aea

hans/tatoeba2,hans/tatoeba2,hans/tatoeba2