Read a code aloud in the listener's language

[octopranav]

What changes

Core

• Spellings.kt holds seven listeners' languages. Each has:
  • its speakers' spelling table for the fifteen letters
  • the digits as that language says them
  • its words for the check character, the decimal point and minus
  • the emergency card's spoken line
• The languages are listed by their own names:
  • Deutsch (DIN 5009:2022, with "zwo" for two)
  • English (the international words, as before)
  • Español
  • Français
  • Italiano
  • Nederlands (the official table of the Netherlands, with "één" for one)
  • Svenska
• aloud, aloudArea and the new aloudCoordinates take a Spelling. PlaceState.view(locale, listener) speaks every line in the listener's words. The emergency card gains said, its whole spoken line in the listener's language.

App

• The read-aloud section has a new chooser, "The listener's language". Each language shows its first three words, for example "Deutsch · Chemnitz, Düsseldorf, Frankfurt". The choice is kept across launches. Until one is chosen, it follows the reader's own language, falling back to the international words.
• Lines are spoken in the listener's language's voice. When the device has none, the section says so, the button turns off, and "Add a voice" opens the speech engine's voice installer. Buttons elsewhere show a short notice instead.

Decisions

• Every callout begins with its letter. Appendix D.2: the listener keeps the first character. The Italian table gives letter names for H, J, K, W and X, and the name of K begins with C. So the table's own alternatives are used: Hotel, Jolly, Kursaal, Washington, Xilofono.
• German uses the 2022 towns, not the older first names. The towns are the current standard, and every word still begins with its letter.
• Spanish has no national table. The words follow the old telephone table from Spain, with Granada for G, because the G of Gerona is said as a J.
• Coordinates are read digit by digit after the point. A voice for a decimal-comma language may take the full stop for a thousands separator. They are read from the written text, so what is heard matches the screen.
• No line is spoken in another language's voice.

Checks

• Core: 140 tests pass, 9 of them new:
  • every word begins with its letter
  • ten distinct digits in each language
  • the order of names and language matching
  • German, French, Italian and Swedish lines for the specification's example
  • "zwo" and "één"
  • coordinates in English, German and Spanish
  • the view and the emergency card read in Italian
• Deliberate break: giving Italian K the word "Cappa" failed the rule test with "Italiano: Cappa for K, expected K but was C".
• Emulator:
  • The chooser lists all seven languages.
  • Choosing Deutsch gives "Goslar, drei, Rostock, Jena, München; neun, acht, Nürnberg, München, neun; Prüfzeichen Tübingen".
  • Read aloud sent a German synthesis request to the speech engine, which opened an audio track.
  • The choice was kept after a relaunch.
  • The emergency card showed and spoke the German line.
  • A temporary build with no Swedish voice showed the note and "Add a voice" and turned the button off. That build was reverted.