[AliEmami81]

With fa_IR active, naturalsize(1) currently returns 1 Byte and naturalsize(42) returns 42 Bytes: the Persian catalog is missing these two messages. Both singular and plural labels should use بایت.

Changes proposed in this pull request:

• Add the two byte-label translations to the existing Persian catalog.
• Extend the existing localization parameterization to cover zero, one, multiple bytes, and negative values. The five added cases fail before the catalog change and pass afterward.

Validation: compiled locale catalogs locally with polib, then ran the non-benchmark suite: 844 passed, 2 skipped (gettext command-line tools are unavailable locally). Ruff and Black checks passed for the changed Python file. Generated .mo files are not committed.

This addresses a different untranslated message from the future-time wording in #461 and is based directly on upstream main. Prepared with AI assistance; the change and regression results were checked locally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.69%. Comparing base (785e5dc) to head (5d6f5ed).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #464   +/-   ##
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  Coverage   99.69%   99.69%           
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  Files          12       12           
  Lines         995      995           
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  Hits          992      992           
  Misses          3        3           

Flag	Coverage Δ
macos-latest	97.58% <ø> (ø)
ubuntu-latest	97.58% <ø> (ø)
windows-latest	93.26% <ø> (ø)

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