Pass `admin:true` in row action link
Add missing 'Apply' button
Change default link values to allow for locale handling
When $url is not an array it must be checked before

This causes invalid offset errors in PHP 5.4:

- Closes GH-181
- Closes GH-225
- Closes #462
Merge branch '1.5-translate'
Load Extensions after Site.locale is loaded from settings.json

Closes #467 (item 1)