8. A client device comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: receiving data indicating a movement of a client device by a first user; determining that the movement of the client device is classified as a delimiter motion for; and based on determining that the movement is classified as a delimiter motion, switching between a first mode, in which the client device (i) configures a language setting of an automated speech recognition engine to transcribe the speech of the first user into text that is in the first language, and (ii) provides a first interface that includes the transcribed text of the first user that is in the first language, and a translation of the transcribed text of the first user that is in a second language, and a second mode, in which the client device (i) configures the language setting of the automated speech recognition engine to transcribe the speech of a second user into text that is in the second language, and (ii) provides a second interface that includes the transcribed text of the second user that is in the second language, and a translation of the transcribed text of the second user that is in the first language, wherein the second interface is different from the first interface, and wherein switching between the first mode and the second mode occurs without the second user physically interacting with the client device.
8. A client device comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: receiving data indicating a movement of a client device by a first user; determining that the movement of the client device is classified as a delimiter motion for; and based on determining that the movement is classified as a delimiter motion, switching between a first mode, in which the client device (i) configures a language setting of an automated speech recognition engine to transcribe the speech of the first user into text that is in the first language, and (ii) provides a first interface that includes the transcribed text of the first user that is in the first language, and a translation of the transcribed text of the first user that is in a second language, and a second mode, in which the client device (i) configures the language setting of the automated speech recognition engine to transcribe the speech of a second user into text that is in the second language, and (ii) provides a second interface that includes the transcribed text of the second user that is in the second language, and a translation of the transcribed text of the second user that is in the first language, wherein the second interface is different from the first interface, and wherein switching between the first mode and the second mode occurs without the second user physically interacting with the client device. 11. The client device of claim 8 , wherein the operations further comprise, while the client device is in the first mode, receiving an utterance of the first user in the first language; and outputting an audio signal encoding the translation of the transcribed text of the first user that is in the second language.