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
Fix "Save as Copy" for article
Fix languages sorting issue
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.
Merge pull request #4916 from joomdonation/patch-2

Fix "Save as Copy" for article issue
[imp] Update CONTRIBUTING.md. Closes #4915

Followed the normal style of using the long form 'pull request' once with short form in brackets (PR) which enables PR to be used for the rest of the document. Grammar and small change for readability.
[fix] Add drop column support for PostgreSQL in Extension manager => Database. Fixes #3313.
[Code Style] Remove blanks
Merge pull request #4917 from joomdonation/patch-3

Fix Sorting Joomla! available languages issue
[Fix] Save as copy for banners, categories,contacts, newsfeeds
cs
codestyle
Merge pull request #4923 from waader/patch-3

Postgres: Install of an additional language fails