I find having Yet Another Browser Tab irritating from time to time. Having a dedicated app that integrates this translation API would be very useful. As it so happens, I would be most likely capable of creating such an app for myself, if the translation service had an API.
Having some kind of API usage allowance for personal use included in my monthly Kagi plan would also be nice, though it probably won't happen given the summarization API doesn't have that, and all API usage is billed separately to credits.