Basic refactoring of findterm to make it easier to update and more inline with searchquery

[elrayle]

Prep for using ldpath with findterm:

• provide access to full config/authority
• use class variables to identify services used in findterm
• use Qa::LinkedData::LanguageSortService for sorting an array of literals instead of rdf_helper module

Part of the goal for the refactoring is to remove the need for the rdf_helper include. The code in that module should be replaced by service calls instead. This refactor did this for language sorting. The next refactor should swap out more of the other methods.