Fix outdated setting layouts (admin & user page) and wrapping some strings
with t()

<fieldset> tags were not used in css files and this was causing settings
to be seen unaligned (enable admin_migration and see the admin page
for example).
changed all fieldsets into <div class='section'> instead.
minor tweaks with layouts
remove unmaintained/moved xmpp app
adding support for plural forms
Merge pull request #1762 from owncloud/l10n-plural-form-extraction-master

adding support for plural forms
[tx-robot] updated from transifex
Merge pull request #1750 from owncloud/remove-unmaintained-xmpp

remove unmaintained/moved xmpp app
Merge branch 'master' into fix-outdated-setting-layouts

Conflicts:
	xmpp/templates/adminSettings.php
	xmpp/templates/userSettings.php
Merge pull request #1739 from owncloud/fix-outdated-setting-layouts

Fix outdated setting layouts (admin & user page) and wrapping for translation
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
Move constants into class
Add namespaces. Allow autoloader to do its job
Move error statuses  to a separate class
Fix constant value
Preparing to introduce customizable statuses
Move scan statuses into DB
Add unit tests