Update admin_lang.php

Search to Szukaj - polish translation
Update redirects and other Ui modifiers
Update to FieldUi namespace
Merge branch 'refs/heads/2.3/develop' into 3.0/develop

Conflicts:
	system/cms/modules/users/controllers/admin.php
Extension class work
Merge branch 'refs/heads/2.3/develop' into 3.0/develop
Changes to extensions classes
Merge branch 'refs/heads/2.3/develop' into 3.0/develop

Conflicts:
	system/cms/modules/addons/src/Pyro/Module/Addons/AbstractExtensionManager.php
Wrong class here
Merge branch 'refs/heads/2.3/develop' into 3.0/develop
Fix Addons admin field types #3153
Merge pull request #3142 from beruniu/patch-2

Update admin_lang.php
Fixes variable. Also fixes #3131
really fixes #3127
Improvements to Extensions and a couple streams tweaks
Merge branch '2.3/develop' of github.com:pyrocms/pyrocms into 2.3/develop
Merge branch 'refs/heads/2.3/develop' into 3.0/develop

Conflicts:
	system/cms/modules/addons/views/admin/field_types/index.php
Map the Pyro\Streams\Model namespace to the sire ref
Update Variables
Update the Blog model