Conflicts:
	src/app/+admin/admin-registries/metadata-schema/metadata-schema.component.ts
	src/app/+community-page/community-page.component.html
	src/app/app.reducer.ts
	src/app/core/auth/server-auth.service.ts
	src/app/core/core.module.ts
	src/app/core/data/item-data.service.spec.ts
	src/app/core/data/item-data.service.ts
	src/app/core/index/index.effects.ts
	src/app/core/index/index.reducer.spec.ts
	src/app/core/index/index.reducer.ts
	src/app/core/shared/operators.spec.ts
	src/app/core/shared/operators.ts
	src/app/header/header.component.spec.ts

58789: Rest call for editing schema (returns 415 unsupported media type atm) + improvements to delete

Issue 298 Language switch

* added metadata schema form, with the form model fields & validation and layout
* fixed the pagination for schemas and fields
* added reducer and actions for the registry state

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