The interface ships in nine languages but the README only read in English, so a
Chinese reader met the project in a language it does not have to use.
README.zh-hans.md follows README.md section by section (569 lines, 27 headings,
7 tables, 8 code blocks), keeping every link, image, command, shortcut and
identifier byte-identical; only prose, alt text, code comments and table headers
are translated. Terminology follows the shipped interface catalog
(crates/ui-egui/locales/zh-hans.json) so the README and the app agree:
曝光, 白平衡, 颜色混合器, 胶片窗格, 留用, 正方形网格, 垂直校正.
Both files gain a language switcher at the top.
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