Update base.php for Dutch

Added dutch translations for base.php
Fix maxlength of fields to edit the user's account in accordance with the user table (#256)
Merge pull request #262 from luizreginaldo/master

Fix maxlength of fields to edit the user's account in accordance with th...
Updated translations (translate.humhub.org)
Merge pull request #261 from cascer1/patch-1

Update base.php for Dutch
Prevent registration when user is already registered but not approved
Merge pull request #4 from humhub/master

Merge Updates