toIcu method
生成该语言的 ICU selectordinal 字符串
Implementation
String toIcu(String language) {
final forms =
translations[language] ?? translations.values.firstOrNull ?? const {};
final parts = forms.entries
.map((e) => '${e.key.name}{${e.value._stripPlaceholderTypes}}')
.join(' ');
return '{$pivotParam, selectordinal, $parts}';
}