language of work or name (P407): language associated with this creative work (such as books, shows, songs, broadcasts or websites) or a name (for persons use "native language" (P103) and "languages spoken, written or signed" (P1412))
format constraint (Q21502404): type of constraint for Wikidata properties: used to specify that the value for this property has to correspond to a given pattern
Commons link constraint (Q21510852): type of constraint for Wikidata properties: used to specify that the value must link to an existing Wikimedia Commons page → Wikimedia Commons namespace → File: