The number of languages available depend on the underlying map and the base URL used. See Map Tile Resources and URL usage for more details.
The complete list of languages available must be retrieved from the server dynamically, as it may vary. See Info for more details about how to retrieve dynamically the list of supported languages.
The usage of these different languages is controlled by the parameters
lg2. Please refer to the description of the parameter depending on the base URL, for example see resource-base-maptile.html#includes-query-parameters for more details.