Delete the coverage tests, the per-language parity checks and the tests
of one language's exact wording. Catalog integrity, placeholder and
plural-form checks stay, as do the engine tests (locale resolution,
plural rules, fallback, language scoping, drawing in a language); those
compare against tr() or the plural rule rather than catalog wording.
Docs describe the report instead of a failing test.
The Russian catalog passed `cargo xtask i18n-coverage` (100% of measured keys)
but lacked the runtime-only labels the other catalogs already carry, so they
showed in English: filter and adjustment parameter names and choices, gallery
names, Camera Raw panels (Balance/Clarity/Dehaze/Color Mixer/Texture/…),
History/Layers/paths/channels menu labels, metadata and File Info fields,
System Info and hardware status lines, rasterize prompts, composed status
templates and dialog text.
All of them are translated (1,229 keys added; the catalog is now 4,227 keys
against upstream's 2,998), written from the meaning of the English labels and
reusing the vocabulary the catalog already uses (Highlights → Света,
Midtones → Полутона, Feather → Растушёвка, Pattern → узор). Filter and gallery
names are aligned with the menu labels already in the catalog so a filter never
reads two ways (Texturizer → Текстуризатор, Unsharp Mask → Нерезкое
маскирование, Shape Blur → Размытие по фигуре, …).
Tests: `russian_covers_generated_filter_options_and_gallery_names`
(filter_dialog.rs, the Italian/Korean/Spanish check) and
`russian_dynamic_status_hardware_and_dialog_labels_are_translated` (i18n/mod.rs).
Docs: docs/localization-ru.md (terminology), localization-parity, gaps G13,
ROADMAP, ATTRIBUTION and LICENSE-translations.
Validated on a rebase onto upstream/main: `cargo test -p photocraft-ui-egui
--lib` 2,998 passed / 0 failed; clippy clean (the only lint is a pre-existing
`nonminimal_bool` in canvas.rs, untouched here and present on upstream main);
`xtask layers` OK; `xtask wasm` OK; `xtask i18n-coverage` ru 1,863 / 1,863;
offscreen `snapshot` in Russian checked.
aiongg