Template:Infobox language/codelist
Usage
{{Infobox language/codelist|code=abc}}→
abc{{Infobox language/codelist|abc}}→
abc{{Infobox language/codelist|abc|def}}→
abc – def{{Infobox language/codelist}}→ (blank returns blank)
{{Infobox language/codelist|code=abc}} → {{Infobox language/codelist|abc}} → {{Infobox language/codelist|abc|def}} → {{Infobox language/codelist}} → (blank returns blank)