Fixes metadata links in collections view (HTML encoding)

[tfr42]

This PR fixes the HTML collections view for linked metadata

[copierrj]

The TMC (without @tfr42 being present) discussed this PR and we are hesitant to merge this as we do not understand why the title of the collection is being used here. Is 'title' always present and is it guaranteed to be unique?

[tfr42]

Indeed the title is not unique but it is unlikely that a user configures two or more collections with the same title within a dataset. In case a configuration contains two or more collections with the same title the HTML view will show then the metadata link for all collections. But it will not break the view or result in an error.
Nevertheless it is possible to change the implementation to use the collection ID instead but would require changes on the server-side (java code) as well.

[tfr42]

Example with a single collection: http://cite.deegree.org/deegree-ogcapi-1.3/datasets/strassenbaumkataster/collections