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Fix grammar-error localisation: $N substitutions and locale fallback - cohort_errs now sets numeric Fluent args ("1" = error form; "2", "3", ... from relations named $2, $3 matched by MSG_TEMPLATE_REL, multiple targets joined with ", "), fixing the arg1/$1 name mismatch and enabling $2+. - €1, €2, ... are all replaced with the corresponding suggestions (was €1 only). - FluentLoader gains get_message_localized: message-level fallback across the requested locales, then default, then any loaded bundle, instead of resolving a single bundle and returning the raw id when it lacks the message. - Suggester carries the full locale priority list rather than a single resolved locale; error_preferences uses the encoded key and the same fallback. - FluentLoader::new keeps partially-parsed resources instead of dropping a whole file on parse error, and disables bidi isolating on interpolated values.