Update issue templates

.github/ISSUE_TEMPLATE/request-new-term.md

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+---
+name: Request new term
+about: Suggest a new term for the ontology
+title: "[TERM]"
+labels: enhancement
+assignees: jsimonclark
+
+---
+
+**Provide a short (max 3 sentences) justification for including the term.**
+A clear and concise description of why the term is needed.
+
+**Required information for your proposed new term**
+[skos:prefLabel](https://www.w3.org/2012/09/odrl/semantic/draft/doco/skos_prefLabel.html) : MyTermLabel
+
+[elucidation](https://w3id.org/emmo#EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9) : a short 1 sentence description of the concept behind the term
+
+**Optional information for your proposed new term**
+[rdf:type](https://www.w3.org/TR/rdf12-schema/#ch_type) : (IRI for where your proposed term fits in the taxonomy)
+
+wikidataReference : (URL of the term in [Wikidata](https://www.wikidata.org/))
+
+wikipediaReference : (URL of the term in [Wikipedia](https://www.wikipedia.org/))
+
+dbpediaReference : (URL of the term in [DBpedia](https://www.dbpedia.org/))
+
+iecReference : (URL of the term in the [IEC Vocabulary](https://www.electropedia.org/))
+
+iupacReference : (URL of the term in the [IUPAC Vocabulary](https://goldbook.iupac.org/terms))
+
+**Have you checked that this term is not already included?**
+Yes/No
+
+**Additional context**
+Add any other context or screenshots about the feature request here.