Fixes #5534

make sure the shared ldap connection is rebound to the configured user after being used for password checking.

For certain file sizes, we rounded to the wrong chunk number
and the returned bogus results. This should fix
https://github.com/owncloud/mirall/issues/1009

Conflicts:
	apps/files_encryption/tests/util.php

- use i18n
- use trim when checking for empty file / folder name
- use more verbose error descriptions

- show tooltip when violating naming constraints while typing
- when target filename exists on server fallback to dialog to interrupt the users flow because something unexpected went wrong
- fixes #5062
- also fixes some whitespace and codestyle issues in files js
- uses css selector over filterAttr in touched js files

Some files app embed themselves under the controls (like the text
editor). The new method FileList.setViewerMode() makes it possible to
properly show/hide the control buttons using the correct permissions.

Apps using this approach must call setViewerMode(true) when starting and
setViewerMode(false) upon closing to restore the controls.

This is needed for #5284

Preview images are now pre-loaded before being set on the file element.

This fixes #5135 and prevents a white space to be displayed while the
thumbnails is being loaded.

- Remove obsolete code that used another approach for hiding emptycontent
- Fixed logic for the showing of the empty content message

Instead of loading the app config setting "shareapi_allow_links" using a
synchronous ajax call that fails when the user is not an admin, this fix
puts the flag directly in the template so it doesn't need to be loaded
afterwards.

Fixes #5440