Locale gap: '%d Byte' / '%d Bytes' untranslated in 33 of 36 locales

[talonwr]

Repro

Activate any locale other than French (e.g. de_DE, ja_JP, ru_RU, es_ES), then call humanize.naturalsize(1) / humanize.naturalsize(300).

Observed

Falls back to English "1 Byte" / "300 Bytes".

Expected

Translated byte strings like French has.

Why

msgid "%d Byte" exists in only 3 of 36 locale files (fr_FR, lv, si_LK). It was added in b172d67 ("Add i18n support for naturalsize() and French translation (python-humanize#294)") — only the French translation shipped with it.

[talonwr]

Verification (captain): merged as #12. Spot-checked compiled catalogs — fr_FR still renders '3.0 Mo'/'1 octet'/'2.9 Mio'; de_DE/es_ES/ja_JP fall back to English source strings (no behavior change). 834 passed / 7 skipped; the 15 test_benchmarks.py setup errors are pre-existing on unmodified main (missing benchmark plugin in this env). GNU single-letter suffixes left untranslated everywhere, as before.