[i18n] ICU plural format - support # and offset

[vicb]

We currently do not support offset nor #

ICU:

    "{num_guests, plural, offset:1 "
      "=0 {{host} does not give a party.}"
      "=1 {{host} invites {guest} to her party.}"
      "=2 {{host} invites {guest} and one other person to her party.}"
      "other {{host} invites {guest} and # other people to her party.}}}"

While this is not strictly required because we can use angular expression, it would be nicer for translators.

For # we need:

• to be able to use escaping, /ref [i18n] escaping in ICU message #9286
• localize the number I18nPluralPipe should localize numbers when using # #11761

[thekip]

Moreover current interpolation syntax in ICU breaks support of ICU in most of the translation tools.

For example ICU from docs:

{VAR_PLURAL, plural, =0 {just now} =1 {one minute ago} other {<x id="INTERPOLATION" equiv-text="{{minutes}}"/> minutes ago} }

Put it to commonly used ICU validator: https://format-message.github.io/icu-message-format-for-translators/editor.html

ICU supprot tools usually don't understand < symbol inside ICU, and if understand they become completele broken when they rich }} inside interpolation tag.

This forces users to search for tool wich is Angular-aware which greatly reduces the choice (i actually didn't find any) or just give up to full ICU syntax and edit it as simple string.

[ValentinFunk]

This would be incredibly nice to have, currently translation tool support for angular is not very good and this would help a lot. It's also a lot nicer to write and read in templates.

Additionally when you look at ICU guides they very often mention the # shortcut and it was a bit suprising to me that this didn't work in Angular.

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