Fix forums to avoid double posts

[ltaravilse]

Sometimes it happens that if you click accidentally twice on the post button you create unintentional double posts, it would be nice to check for double posts and avoid them. For example, don't let a user post more than once in a 2 seconds time range.

[lstkz]

Here is a simple frontend fix http://stackoverflow.com/questions/2830542/prevent-double-submission-of-forms-in-jquery @birdofpreyru