Add nan (zh-min-nan) to plurals.xml

[ionull]

Nan is used widely by 46 million people

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(Optional) Fixes [link to the issue]

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[ionull]

There is some error with the current logic of load plural string, when we add an unknown language like "nan", it fails to load category which cause crash:

// PluralStringResources.kt
private suspend fun loadPluralString(
    resource: PluralStringResource,
    quantity: Int,
    resourceReader: ResourceReader,
    environment: ResourceEnvironment
): String {
    val resourceItem = resource.getResourceItemByEnvironment(environment)
    val item = getStringItem(resourceItem, resourceReader) as StringItem.Plurals
    val pluralRuleList = PluralRuleList.getInstance(
        environment.language,
        environment.region,
    )
    // pluralRuleList is empty, pluralRuleList.getCategory(quantity) will crash
    // we'd better check empty status and use item.items[PluralCategory.OTHER]
    val pluralCategory = pluralRuleList.getCategory(quantity)
    val str = item.items[pluralCategory]
        ?: item.items[PluralCategory.OTHER]
        ?: error("Quantity string ID=`${resource.key}` does not have the pluralization $pluralCategory for quantity $quantity!")
    return str
}