I18n::translateCount() does not work with languages with more than 3 cardinal forms

[neildaniels]

Describe the bug
For languages such as Czech, Irish, Russian, or Welsh, the current I18n::translateCount() and tt() functions are not helpful. The current functions assume there can be only 3 forms of numbers (for 0, 1, and everything else).

For a language like Irish, there can be 5 distinct forms:

• when the value is 1
• when the value is 2
• when the value is 3, 4, 5, or 6
• when the value is 7, 8, 9, or 10
• when the value is anything else, such as 0, 11, 24

Unicode has a published table documenting nearly every language's rules: https://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html

Mozilla has a more approachable document for this: https://developer.mozilla.org/en-US/docs/Mozilla/Localization/Localization_and_Plurals

I suspect ngettext would be helpful to use in this scenario.

Kirby Version
3.3.3

[bastianallgeier]

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