* { messages.length, plural,
* =0 {zero}
* =1 {one}
* =other {more than one}
* }
*
* will be expanded into
*
* <ul [ngPlural]="messages.length">
* <template [ngPluralCase]="0"><li i18n="plural_0">zero</li></template>
* <template [ngPluralCase]="1"><li i18n="plural_1">one</li></template>
* <template [ngPluralCase]="other"><li i18n="plural_other">more than one</li></template>
* </ul>
From expander.ts
The plural should be expanded to a text node and not add element nodes