Complete English localization for desktop and web UI

[Qyperion]

Summary

Eliminates all Chinese text from the English UI across both the desktop (PyQt5) and web (NiceGUI) editions. Adds 290+ bilingual translation keys and fixes a functional bug where preset model configurations silently failed to apply in English mode.

Problem

With English (en_US) selected as the display language, hardcoded Chinese strings were still visible throughout the UI — in tooltips, dialog titles, button labels, status messages, preset descriptions, authentication pages, and more.

Changes

Locale files — locales/en_US.json, locales/zh_CN.json

• Added 290+ translation keys across ~20 sections: tooltips, preset descriptions (agents, categories, models), dialog titles, status messages, validation errors, and more

Desktop monolith — opencode_config_manager_fluent.py

• Replaced ~500 hardcoded Chinese UI strings with tr() calls
• Tooltips now resolved via get_tooltip(key) which tries tr("tooltip.") first, falling back to the Chinese dict value
• Preset descriptions resolved via _tr_preset(section, key, fallback) with the same fallback pattern

Core modules — occm_core/ (8 files)

• config_manager.py, config_validator.py — validation messages, dialog text
• remote_manager.py, monitor_service.py, version_checker.py — network status, update prompts
• agent_groups.py, cli_export.py — group management labels, export messages
• native_providers.py, plugin_manager.py, skill_manager.py — provider/plugin/skill UI text

Web edition — occm_web/ (3 files)

• main.py — startup messages
• app.py — application title
• auth.py — login/registration page labels and validation messages

Bug fix

Fixed a functional bug where preset model configurations (Claude, OpenAI, Gemini, etc.) silently failed to apply in English mode. Root cause: internal lookup functions (_custom_resolve_model_category, _resolve_category_for_preset, _get_category_bulk_support, _custom_apply_batch_config) were returning tr()-translated values (e.g. "Claude Series") to look up keys in MODEL_PRESET_PACKS which uses Chinese keys ("Claude 系列"). Fixed by reverting these functions to return raw Chinese keys for internal dict lookup, while keeping _get_group_key() translated for UI display.

What was NOT changed

• Code comments and docstrings — internal, not user-facing
• Internal log messages — developer-facing only
• Dict keys used for internal lookup (e.g. MODEL_PRESET_PACKS, MODEL_PRESET_DEFAULT) — translated at the point of UI display, not at the data layer
• occm_core/i18n.py and occm_web/i18n_web.py — i18n infrastructure unchanged

[Copilot]

Pull request overview

This PR completes English localization coverage across the app (desktop PyQt + web NiceGUI) by replacing remaining hardcoded Chinese UI strings with translation lookups and expanding the locale dictionaries. It also addresses a functional bug where preset model configurations failed to apply in English mode due to translated labels being used for internal dict lookups.

Changes:

• Replaced hardcoded UI/user-facing strings in core + web modules with tr() keys (and added supporting locale entries).
• Expanded locales/en_US.json and locales/zh_CN.json with 290+ new translation keys across many UI sections.
• Adjusted several core services/managers (auth, monitoring, remote management, validation, exporting, skills/plugins, etc.) to emit localized messages.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
occm_web/auth.py	Localizes login/change-password UI labels and API messages.
occm_web/app.py	Updates global exception log message wording (developer-facing).
occm_web/main.py	Localizes CLI help text and startup console messages to English.
occm_core/version_checker.py	Localizes rate-limit/network error strings.
occm_core/skill_manager.py	Localizes validation/errors and install/update progress messaging.
occm_core/remote_manager.py	Localizes connection/config errors and remote operation failures.
occm_core/plugin_manager.py	Localizes plugin install/uninstall/version-check error output.
occm_core/native_providers.py	Adjusts provider display names to remove embedded Chinese text.
occm_core/monitor_service.py	Localizes monitor status/error messages.
occm_core/config_validator.py	Localizes validation issue messages and summary output.
occm_core/config_manager.py	Localizes JSON/JSONC parse failure diagnostics.
occm_core/cli_export.py	Localizes export/validation error messages and CLI export failures.
occm_core/agent_groups.py	Localizes agent group preset names/descriptions and CRUD error output.
locales/zh_CN.json	Adds/normalizes many zh_CN translation keys referenced by new tr() calls.
locales/en_US.json	Adds/normalizes many en_US translation keys referenced by new tr() calls.

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[Copilot]

NativeProviderConfig.name is still hardcoded and was changed to English-only here. The web/desktop UIs render this field directly (without tr()), so zh_CN users will also lose localized provider names. Consider keeping language-neutral data here and localizing provider display names at the UI layer via translation keys (e.g., based on provider id).