1. A method comprising: in response to a request to identify a supported language that has a set of translations for use in translating content, at least one computing device using a current language tag to identify the supported language, the current language tag comprising one or more subtags, each subtag providing language identification information; in response to determining that a language referenced by the current language tag is not the supported language, the at least one computing device performing elements comprising: accessing a stored set of mappings comprising one or more mappings, each mapping associating a first language tag with a second language tag; determining whether or not a mapping in the set of mappings includes the current language tag as one of the first and second language tags and a new language tag as the other of the first and second language tags; and using the new language tag as the current language tag to identify the supported language.