Fallback languages are not correctly used in the hierarchy view

[henriyli]

At which URL did you encounter the problem?

http://dev.finto.fi/hero/fi/page/p1535?clang=sv

What steps will reproduce the problem?

1. Open the above URL

What is the expected output? What do you see instead?

Expected to see consistent fallback labels (in the same language) for the hierarchy view. However, each label seems to fallback to a random language.

This happens as the REST hierarchy query currently supports only using a single fallback. It should be refactored to support queries with a list of prioritized fallback languages.

[osma]

GenericSparql.queryParentList should be passed an array of fallback languages instead of just one. The generateParentListQuery method should then generate one OPTIONAL block per fallback language.

[osma]

Not critical for 2.0, moving to Next Tasks