Add class for translation of dynamic elements: number of notes, reviews, etc.

Base on: https://github.com/php/web-php/pull/1057#discussion_r1748003699

I suggest add methods for different languages to form on doc-site correct plurals for different dynamic elements: the total note count, the number of upvotes, etc.

Maybe something like this:

https://onlinephp.io/c/bdfda

Contributors from each country will only have to implement their plural method and call in the code:

<?php

$num_notes = 1;
echo NumberBaseDeclinsion::decline($num_notes, ['note', 'notes',], 'en',); // 1 note
echo NumberBaseDeclinsion::decline($num_notes, ['заметка', 'заметки', 'заметок',], 'ru',); // 1 заметка

$num_notes = 2;
echo NumberBaseDeclinsion::decline($num_notes, ['note', 'notes',], 'en',); // 2 notes
echo NumberBaseDeclinsion::decline($num_notes, ['заметка', 'заметки', 'заметок',], 'ru',); // 2 заметки

$num_notes = 5;
echo NumberBaseDeclinsion::decline($num_notes, ['note', 'notes',], 'en',); // 5 notes
echo NumberBaseDeclinsion::decline($num_notes, ['заметка', 'заметки', 'заметок',], 'ru',); // 5 заметок

// Phrase
echo NumberBaseDeclinsion::decline(38, ['pink flamingo', 'pink flamingos',], 'en',); // 38 pink flamingos
echo NumberBaseDeclinsion::decline(38, ['розовый фламинго', 'розовых фламинго', 'розовых фламинго',], 'ru',); // 38 розовых фламинго

// And if you want the text not to break between the number and the next word, you can add an unbreakable space:
echo NumberBaseDeclinsion::decline(8, ['comment', 'comments',], 'en', '&nbsp;',); // 8&nbsp;comments

More examples can be found at the link.

In particular, if you translate the total number of notes of the contribution notes, then for the Russian language you will need 1 singular form + 2 plural forms. And for English, only two forms are enough. Therefore, a separate method (or function, if it is decided to write in a functional style) will be required for each language, which will form the correct string with a number for its language

Start by reading the discussion in php/web-php#1057 and the linked onlinephp.io examples. Identify how dynamic counts are currently rendered and which languages need plural rules. Done means an agreed design and implementation for language-specific formatting of counts such as notes, reviews, and upvotes.