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ID: extract literal strings to named class constants (#38)

Ports the lang_ID.py refactor portion of savoirfairelinux/num2words#293
by @jenniegunawan, originally bundled with the ID/MS split (which
num2words2 already ships separately).

Replaces four hardcoded literals scattered through the conversion logic
with class constants that subclasses can override:

- ZERO              ("nol")
- DECIMAL_SEPARATOR ("koma")
- CURRENCY          ("rupiah")
- MINUS_SIGN        ("min")

No behavior change — all 7 existing ID tests still pass — but the
constants make the file easier to extend (e.g. for a future MS
subclass that wants to override one literal without copying the
whole conversion logic).

Original PR: https://github.com/savoirfairelinux/num2words/pull/293
(Behavior parts of the upstream PR — the ID/MS split itself — were
already in num2words2.)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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