Prevent button click when enter key is pressed in LDAP wizard

Pressing enter in the LDAP wizard will trigger a click on the first
button. In the main page it would trigger the delete dialog, which is
quite inconvenient.

Added a type attribute to suppress this behavior.
Log warning when no uid was found for user

In some incomplete setups (like mine) it can happen that the uid
attribute of users is missing.

To be able to find out that something is wrong, a debug message is now
logged when it has not been found.
Urlencode file name before passing it to cURL

Large file helper use cURL to determine file sizes. Thus filenames must be
urlencoded in case special symbols like '#' can cause BadRequest errors.

Signed-off-by: Tony Zelenoff <antonz@parallels.com>
apply @carlaschroder's changes from owncloud/documentation#594
Additional changes to config.sample.php and typo fixes
Merge pull request #11486 from owncloud/config-update

Config update
[tx-robot] updated from transifex
Merge pull request #11501 from Ansud/master

Urlencode file name before passing it to cURL
Merge pull request #11480 from owncloud/ldap-enterkey-deletefix

Prevent button click when enter key is pressed in LDAP wizard
Merge pull request #11499 from owncloud/ldap-warningwhenuidismissing

Log warning when no uid was found for user