Can't vote after answering

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Right now, after we answered a question, we can't vote anymore on this question.

The reason is that javascript used a label present only on the answer form before binding the buttons (question-subscribe-updates) and this label doesn't appear with the "Edit your previous answer" button (and of course, when javascript fails, you won't know it ...)

There is 2 solutions to fix this :

• Removing the wrong javascript part when user already answered the question (doesn't require a lot of work)
• Always add the missing label (requires some more work, but may be more relevant ...)