_extract_entities used the ASCII-only class [A-Z][a-zA-Z]+ to pull name
entities from a query, so non-ASCII names were dropped ("İstanbul",
"Zürich" yielded nothing) or shredded ("São Paulo" -> only "Paulo"),
degrading query enhancement for non-English/accented searches. Match
Unicode words and keep the alphabetic, uppercase-initial ones; ASCII
behaviour (the word boundary already excludes camelCase mid-word
capitals) is unchanged.
* fix: detect question words as whole words, not prefixes
* fix: same question-word prefix bug in the services search copy
* test: question-word detection rejects prefix lookalikes
* fix: extract full year in research query entities, not just the century
* fix: same year capture-group bug in the services search copy
* test: research query extracts the full year
Ohualtex