Firefox translate - to open it in your firefox or one of its forks just paste about:translations#src=detect into url bar. For Android see Offline Translator
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On what platform?
You wrote app so I assume android or iOS. I'm on /e/os by murena but it's android and currently I'm only using Offline Translator by David Ventura. Here's the apps github page. It didn't trip /e/os tracking detector even once so check it out if you're interested.
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