Using name as pkey of meta_contexts

Fixing a query that used the removed meta_contexts.id

Refactored meta_context_id to meta_context_name

Railguard MetaContextName fixing

Railguard MetaContextName fixing

Railguard MetaContextName fixing

Railguard MetaContextName fixing

Railguard MetaContextName fixing

Railguard MetaContextName fixing
Displaying configurable context in list views

[Finish #47590523]

Add displayed_meta_contexts to app_settings

Added configuration of second and third displayed meta_context

  to the app_settings admin interface

Loading app_settings in before filter; initializing MediaResourcesController.Index with it

Setting data attribute for contexts to true

Add window.AppSettings object; Revert initializing MediaResourcesController.Index

This reverts commit 8bff2fdf562c45aa9cc26fc7b1413901125f1847.

Displaying context

Removed @wip from feature

Started with writing test

Finished feature test for configurable contexts in lists