This template validates Wikipedia:Good article topics. It serves as a lookup list for GA topics in templates such as {{Article history}} and {{GA}}. A value passed to this template is matched to the valid topic name (or one of its variants), outputting the full name of the topic. An invalid value returns only whitespace. There are 15 valid GA topics. For example, passing "langlit" returns "Language and literature", passing "Language and literature" returns "Language and literature", and passing "Xyzzy" returns an empty string. Example of validation: {{#ifeq: {{GA/Topic|{{{topic}}}}} | topic valid | topic invalid}}
