[KagurazakaNyaa]

Summary

Adds a complete Simplified Chinese localization: src/main/resources/assets/nuclearcraft/lang/zh_cn.json.

2805 entries, matching en_us.json one-to-one — every key generated by ModLanguageProvider is covered, with no missing and no extra keys.

The file lives next to ru_ru.json in src/main/resources rather than src/generated, since it is a hand-maintained translation rather than datagen output (same reasoning as the Russian file).

Coverage

Group	Count	Example
Items	1239	Uranium 235 Ni → 铀-235-氮化物
Fluid types	493	Molten Uranium 238 Ox → 熔融铀-238-氧化物
Blocks	296	Active Water Heat Sink → 运行中水散热器
UI / tooltips / ponder	792	see below

Naming conventions

Translations follow the shapes already established by the older zh_cn file that existed up to 1.20, so existing players' muscle memory still works:

• Materials: <material><form> — Aluminum Ingot → 铝锭, Boron Dust → 硼粉
• Fluid buckets: 桶装 — Steam Bucket → 桶装蒸汽
• Fission fuels keep the classic scheme: Fuel Uranium HEU-235 OX → 高浓度铀-235-氧化物燃料, Depleted Uranium LEU-233 → 枯竭低浓度铀-233燃料
• Isotope cladding uses hyphen separators for readability: Uranium 235 Za → 铀-235-锆合金
• Tier words move before the head noun, as Chinese requires: Plate Elite → 精英板, Solar Panel Advanced → 高级太阳能板

Deliberately left in English

TRISO, QNP, FLiBe, HEV, grid sizes like 3x3, and the jukebox song titles — all are proper nouns or notation where a translation would hurt readability.

Verification

• Key coverage: 2805 / 2805, zero missing, zero extra
• Format specifiers (%s, %d, %1$s, %%): verified as an exact multiset match against en_us.json for all 2805 keys
• Unit strings (FE/t, H/t, keV, MK, …) preserved verbatim
• Punctuation: full-width throughout, no half-width punctuation adjacent to CJK
• Multi-line tooltips keep their newline structure
• ./gradlew clean build passes; the file is packaged into the jar at assets/nuclearcraft/lang/zh_cn.json (md5 verified against source)

Note on a pre-existing gap (not touched by this PR)

While cross-checking I noticed that 75 keys referenced from Java (e.g. multiblock.validation.wrong_outer, multiblock.turbine.bearing_count) have no English entry in en_us.json — so English players currently see raw key strings for multiblock validation failures. The same gap exists in ru_ru.json. I left this alone to keep this PR a pure translation change; happy to submit a follow-up if you'd like.

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Translated with careful attention to the nuclear terminology (α/β decay, isotopes, cladding forms) and to preserving the mod's dry humour in the Ponder tutorials and the Resonite crystal patron anecdotes.

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