Merge branch 'resolvers-branch-angular6' of https://git.atmire.com/contributions/dspace-angular into patch-support

Conflicts:
	src/app/core/cache/builders/remote-data-build.service.ts
	src/app/core/metadata/metadata.service.ts
	src/app/core/shared/item.model.ts
	src/app/shared/loading/loading.component.ts
	yarn.lock

Conflicts:
	src/app/app.module.ts

Issue 313: add support for paginated properties on dspace objects

Issue 311: No files item page bugfix

#293 Added link with the query quoted for search results if empty

Conflicts:
	src/app/core/data/request.models.ts
	src/config/cache-config.interface.ts

If there is an error 400 or a search returns an empty result this commit will show a link with the query quoted. 
Also improved testing of search results component as the component has changed.

Hide metadata labels without value

Conflicts:
	src/app/core/auth/auth-response-parsing.service.spec.ts
	src/app/core/auth/auth.service.ts
	src/app/core/auth/models/auth-status.model.ts
	src/app/core/auth/server-auth.service.ts
	src/app/core/data/data.service.spec.ts
	src/app/core/data/data.service.ts
	src/app/core/data/dspace-object-data.service.ts
	src/app/core/data/item-data.service.spec.ts
	src/app/core/data/item-data.service.ts
	src/app/core/data/request.models.ts
	src/app/shared/auth-nav-menu/auth-nav-menu.component.ts
	src/app/shared/mocks/mock-form-service.ts
	src/app/shared/mocks/mock-remote-data-build.service.ts
	src/app/shared/mocks/mock-store.ts

Conflicts:
	package.json
	src/app/+search-page/search-filters/search-filters.component.ts
	src/app/core/auth/auth.effects.ts
	src/app/core/auth/auth.service.ts
	src/app/core/auth/server-auth.service.ts
	src/app/core/data/comcol-data.service.ts
	src/app/core/data/community-data.service.ts
	src/app/core/data/data.service.ts
	src/app/core/data/item-data.service.ts
	src/app/core/shared/dspace-object.model.ts
	src/app/header/header.component.spec.ts
	src/app/shared/auth-nav-menu/auth-nav-menu.component.ts
	src/app/shared/testing/auth-service-stub.ts
	yarn.lock

Initial German Translation 

Issue #295 Dutch translation

Czech translation