* uses zxcvbn
 * outsourced to separate jquery plugin
 * async loading
 * hide strength meter if input is empty
 * feedback if user enters weakest password
 * fade in and out
 * show tipsy with strength
 * Opera 12, IE8-10, FF 23, Chromium 29

- Refactored file tr lookup into FileList.findFileEl that uses
  filterAttr to avoid escaping issues in jQuery selectors
- Fixed versions and sharing app to properly escape file names in
  attributes

Fix for case described in https://github.com/syncloud/owncloud-setup/issues/19

Some apps might not define the same "nplural" value.
To avoid conflicts, the plural function is now generated per app.

Fixes #6427

On the update page, config.js was missing which caused oc_webroot to not
be available. That would trigger the faulty oc_webroot fallback that
didn't take URLs like "/owncloud/index.php/files/apps" into account.

This fix adds config.js in the update page and also a fix for the
oc_webroot fallback, in case it is used elsewhere.

This reverts commit f12363d9, reversing
changes made to eba35d28.