Which popular language learning platform's name derives from the Spanish phrase for 'two tongues' - reflecting its mission to make users bilingual?

In the world of language and linguistics, branding plays a crucial role in how companies position themselves. Successful language learning platforms and linguistic tools often create distinctive brand identities through careful naming strategies, taglines, and positioning. This trivia question explores how one major language learning brand leveraged linguistics in its very name to create a memorable identity that reflects its core mission.

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Duolingo
Babbel
Rosetta Stone
Lingoda