curl --location --request GET '/api/admin/analytics/by-language?startDate&endDate&bookId'{
"data": [
{
"languageId": 1,
"languageName": "English",
"languageCode": "en",
"totalDownloads": 2800,
"totalBooks": 3900,
"legacyDownloads": 5000
},
{
"languageId": 2,
"languageName": "French",
"languageCode": "fr",
"totalDownloads": 1500,
"totalBooks": 2100,
"legacyDownloads": 2400
}
]
}