Add translation support for multi-value error and warning entities

[Copilot]

Error and warning entities display comma-separated error codes (e.g., OFFLINE_MOTOR_1,REGENERATIV_20) which HomeAssistant's standard translation mechanisms cannot handle since they only translate single enum values, not concatenated strings.

Implementation

• Translation files: Added 44 error code translations in strings.json, en.json, de.json under entity.sensor.{sensor_key}.state.* format
• TranslatableErrorMixin: Loads translations via async_get_translations() when entity is added to HA, provides _translate_code() method
• ErrorSensor/WarningSensor: Apply mixin, translate individual codes before joining with ", " separator
• Attributes: Raw codes preserved in error_codes/warning_codes attributes for automation use

The implementation uses HomeAssistant's official translation system with the proper format (entity.sensor.errors.state.{error_code}) that passes hassfest validation.

Example

Before: State shows OFFLINE_MOTOR_1,REGENERATIV_20

After:

• State shows Motor 1 offline, Regeneration salt level < 20% (or German equivalent)
• Attributes contain error_codes: ["OFFLINE_MOTOR_1", "REGENERATIV_20"] for automations

# Automations can still use raw codes via attributes
condition:
  - condition: template
    value_template: "{{ 'OFFLINE_MOTOR_1' in state_attr('sensor.bwt_perla_errors', 'error_codes') }}"

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[dkarv]

@copilot Checks are failing, please investigate

[Copilot]

@copilot Checks are failing, please investigate

Fixed the hassfest validation errors. The issue was using an invalid translation structure. Now using the proper HomeAssistant format: entity.sensor.errors.state.{error_code} and entity.sensor.warnings.state.{error_code}.

Changes in commit 4c0752e:

• Translations now use HomeAssistant's native translation system
• Error codes stored under entity.sensor.{sensor_key}.state.{code}
• Loads translations via async_get_translations from HA
• Both English and German translations maintained in proper JSON files

The integration now properly uses HA's translation system instead of hardcoded values.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• developers.home-assistant.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)