Add CLDR plural categories with a legacy translation path

[DirkDoes]

Purpose of this PR:

Keep global t() and add count-based category lookup for zero/one/two/few/many/other using CLDR cardinal rules for the selectable languages. Named count arguments and positional counts are supported; fallback recomputes the English plural category.

Add t_legacy() for exact numeric/.n variants and move the current numeric-key callers, including tTime(), to it. Imported production YAML is unchanged. Test-only embedded translations exercise the new categories.

Based on #499. Merge after the lower settings layers; works without live localization.

How to Test:

dotnet test WheelWizard.sln

580 tests passed (561 unit, 19 headless UI), including decimal counts, language-specific rules, English fallback, named/positional calls, and legacy behavior.

What Has Been Changed:

See the focused implementation above. The existing settings JSON contract and imported translation sheets are preserved.

Related Issue Link:

No linked issue. Part of native GitHub stack #503.

Checklist before merging

• You have created relevant tests

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