refs #22341 [fid] added datatable for better user lists

* additional stylings for datatables and implementation of language aware interface
* removed reference to bbi feature 'icon' and export button alltogether as it wasnt present before anyway
* added datatable for better user lists
* implementation of language aware interface
* changed datatables implementation, now via headscript/style, reverted various changes

co-authored by: Alexander Purr <purr@ub.uni-leipzig.de>
* re-adding reverse ordering from ref 16383
* dataTable footer search-inputs always with 100%
* set relative lang-file path