It's useful to provide users more embedded translators, because not only google and yandex translators are popular and used in the world.

Requirements

To pretend to be embedded, translator must match with a basic requirements

• Translation quality must be high
• API must be stable and high available
• Translation must be fast
• Translator must be public available and be able to handle many requests

Translators to research and implement

• SimplyTranslate
• Reverso®
• https://translate.glosbe.com/ (Glosbe Translate hosted by Glosbe)
• https://translate.wmcloud.org/ (MinT Machine translation hosted by Wikimedia Foundation) - API spec (https://translate.wmcloud.org/api/spec)
• https://mymemory.translated.net/
• https://github.com/janvarev/OneRingTranslator

Related links with discussions about translators

• https://github.com/FilipePS/Traduzir-paginas-web/issues/661
• https://github.com/immersive-translate/immersive-translate/discussions/694
• https://github.com/chunibyocola/sc-translator-crx/issues/139

Related projects to discover translators

• https://github.com/Bnyro/TranslateYou