Hi!
The Wikidata property "has dialect" ("dialecte" in Catalan) is considered for replacement by a new property "dialect of": https://www.wikidata.org/wiki/Wikidata:Properties_for_deletion#has_dialect_(P134) , which stores the same information but in the other direction.
It is used in three templates of this Wikipedia:
These templates will need to be adapted to the new schema once the property is deleted. You welcome to join the discussion at Wikidata.