Inconsistent locale coverage across editor crates — missing ru and empty locale sets

Summary

The locale coverage across editor crates is inconsistent. Some crates have the ru (Russian) locale, others don't. Two crates have no locale files at all.

Current locale coverage

Crate	en	zh-CN	zh-HK	pt-BR	it	ru	lol
ui_common	✅	✅	✅	✅	✅	✅	✅
ui_level_editor	✅	✅	✅	✅	✅	✅	✅
ui_problems	✅	✅	✅	✅	✅	✅	✅
ui_type_debugger	✅	✅	✅	✅	✅	✅	✅
ui_core	✅	✅	✅	✅	✅	❌	✅
ui_file_manager	✅	✅	✅	✅	✅	❌	✅
ui_flamegraph	✅	✅	✅	✅	✅	❌	✅
ui_log_viewer	❌	❌	❌	❌	❌	❌	❌
ui (wgpui-component)	❌	❌	❌	❌	❌	❌	❌

Missing ru locale: ui_core, ui_file_manager, ui_flamegraph No locale files at all: ui_log_viewer (see #479), ui (wgpui-component, see #478)

Additionally, the lol (LOLCAT) locale exists in most crates as a pseudo-locale for testing — it should probably be consistently present or consistently removed.

Suggested fix

1. Add ru.yml to ui_core, ui_file_manager, and ui_flamegraph (translations can be sourced from the existing ru.yml in ui_common etc.)
2. Once #478 and #479 are resolved, ensure the new locale files match the supported locale set
3. Consider establishing a CI check that verifies all editor crates with rust-i18n have the same set of locale files