Sets the current language to specified. The parameter is the BCP47 language tag. If a language pack is not downloaded yet, spawns automatically the
ovr_AssetFile_DownloadByName() request, and sends periodic ovrMessage_Notification_AssetFile_DownloadUpdate to track the downloads. Once the language asset file is downloaded, call
ovr_LanguagePack_GetCurrent() to retrieve the data, and use the language at runtime. ovrMessage_LanguagePack_SetCurrent will be generated in response.