Prepare SOCATS Dictionaries for Quanteda Matching
prepare_socats_dictionaries.RdTransforms SOCATS_Dictionaries into a quanteda dictionary
object for social category matching. The result is cached in a package-level
environment so it only needs to be computed once per R session.
Preprocessing includes UTF-8 encoding, lowercasing, dash-to-space conversion,
lemmatization, removal of ending Ss, and punctuation/symbol removal.