[FIX] website: responsive images in table for Firefox only

It looks there is a bug in Firefox concerning responsive images in table. See bugzilla https://bugzilla.mozilla.org/show_bug.cgi?id=975632
Bootstrap advises to use width: 100% for .img-responsive as workaround were needed.
The @moz-document is to apply this for Mozilla only.

opw-617582
opw-618659
[FIX] website_forum: allow moderators to see misbehaving user profiles

This is to help forum moderators to fight against
spammers. It was previously difficult as the spammer
profile became unreachable as soon as their karma
went below 1, even if they had other questions
or answers still published.
[FIX] website_forum: restore bind to onclick because CKE Editor uses it, so on('click', fun) breaks things.

Fixes bugs with z-index error on some popups (image selector for example...)
[FIX] website_forum: fix error 500 when editing an answer

Was caused by missing tags.
Also fix also backwards-compatibility for textext selection method.
[FIX] website_forum: use other attr than value to init select2

The backend would otherwise fail because the value has been already processed