Fixes #3918 - Activate / Deactivate All plugins doesn't play well with deps system
Fixes #4696 - Add JSON gallery view
more accurate error messages when plugins cannot be enabled
Merge branch 'pr-5624'
Merge pull request #5636 from Srokap/ticket_4696

Fixes #4696 - Add JSON gallery view
Fixes #5630 - 404 error page redirect loop
Fixes #5629 - Adds support for several HTTP response codes to core error page handling
updated documentation for error page handler
display two letter language code for missing translations and set English as language in installer for the installation
Merge pull request #5637 from cash/installer_warnings

possible fix for CLI installer warnings