Added icon support for JHtmlSidebar::addEntry
Added isset check
Merge branch 'staging' of https://github.com/joomla/joomla-cms into staging
Use article_index_text as heading
Merge branch 'staging' of https://github.com/joomla/joomla-cms into staging
[fix] Inconsistency on list view output when 'no results' are available at backend
[fix] Inconsistency on list view output when 'no results' are available at backend com_installer, com_modules, com_plugins, com_templates
Merge branch 'staging' of github.com:joomla/joomla-cms into listviews
Don't polute the page with javascript
href
[Fix} Mail: allow domains as domain.edu.co
Don't polute the page with javascript
href
Merge branch 'Remove_jsscriptcode_isis' of https://github.com/dgt41/joomla-cms into Remove_jsscriptcode_isis

Conflicts:
	administrator/templates/isis/index.php
domain without .xx should not validate
reverting checking for dot + changing test to true
Fix "Save as Copy" for article
Fix languages sorting issue
changed one condition to let the tests pass, splited one test in two and used more specifc annotations
Postgres: Install of an additional language fails

I installed the current staging branch using postgresql successfully. Afterwards I tried to install an additional language in the backend but it failed with the following message:

0 Database query failed (error # %s): %s SQL=SELECT "update_id" FROM "aehqu_updates" WHERE element = 'de-DE' AND type = 'language' AND client_id = '' AND folder = '' 

After applying this patch the installation went fine. I borrowed the idea from #1695.