- Only process 'english' field for IPA replacement. German and example
fields contain meaningful parenthetical content like (gefrorenes Wasser),
(sich beschweren) that must never be replaced.
- Simplify _is_grammar_bracket_content: only known grammar particles
(with, about/of, sth, etc.) are preserved. Removes the >= 4 chars
heuristic that incorrectly preserved garbled IPA like [breik], [maus].
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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