Polyglot voice clips: synthesized with Piper (https://github.com/OHF-Voice/piper1-gpl) from the voices below.
Each clip is the card's text read by a computer voice, not a recording of a person. Made by drafts/make-audio.cjs + make-audio.py.

Language  Voice                         Dataset licence (from the voice's MODEL_CARD, read 2026-10-13)
French    fr_FR-siwis-medium            CC BY 4.0: SIWIS French Speech Synthesis Database, University of Edinburgh / Idiap (https://datashare.is.ed.ac.uk/handle/10283/2353)
Spanish   es_ES-davefx-medium           CC0
Italian   it_IT-serena-medium           CC BY 4.0: serena-synthetic-it-27h (https://huggingface.co/datasets/committa/serena-synthetic-it-27h)
Latin     it_IT-serena-medium           (Italian voice reading Latin spelling; no Latin voice exists)
Greek     el_GR-rapunzelina-medium      CC0 (Greek Single Speaker Speech Dataset)
Russian   ru_RU-denis-medium            CC0
Ukrainian uk_UA-ukrainian_tts-medium    CC0
Polish    pl_PL-gosia-medium            CC0
German    de_DE-thorsten-medium         CC0: Thorsten-Voice (https://github.com/thorstenMueller/Thorsten-Voice)
Portuguese pt_BR-faber-medium           CC0 (https://github.com/OHF-Voice/voice-datasets)
Bulgarian bg_BG-dimitar-medium          CC0
Catalan   ca_ES-upc_ona-medium          CC BY-SA 3.0 ES: UPC (Universitat Politecnica de Catalunya) ona dataset
Czech     cs_CZ-jirka-medium            CC0
Danish    da_DK-talesyntese-medium      CC0
Estonian  et_EE-news-medium             CC BY (META-SHARE "Available - Unrestricted Use")
Basque    eu_ES-antton-medium           CC BY 4.0
Persian   fa_IR-amir-medium             CC0
Finnish   fi_FI-harri-medium            CC0
Hungarian hu_HU-anna-medium             CC0
Latvian   lv_LV-aivars-medium           CC0 1.0 Universal
Norwegian no_NO-talesyntese-medium      CC0
Romanian  ro_RO-mihai-medium            CC0
Slovak    sk_SK-lili-medium             CC0
Slovenian sl_SI-artur-medium            CC BY 4.0
Albanian  sq_AL-edon-medium             CC0
Swedish   sv_SE-nst-medium              CC0
Vietnamese vi_VN-vais1000-medium        CC BY 4.0
Bengali   bn_BD-google-medium           CC BY-SA 4.0 (Google crowdsourced Bengali speech data) and the
                                        CMU/Festival licence; notice kept, no endorsement by either implied
(These licences were read from each voice's MODEL_CARD on 2026-10-15.)

Japanese has no clips: its only Piper voice (hi_fi_captain) is CC BY-NC-SA, which a public app cannot use.

ASL fingerspelling pictures (app/asl/A.svg ... Z.svg): public-domain drawings by wpclipart.com, from Wikimedia Commons
(https://commons.wikimedia.org/wiki/File:Sign_language_A.svg and the matching B..Z files). Licence read from the Commons API 2026-10-13.
ASL has no voice clips: it is a signed language.