v3.29.0 - i18n & Translation System

What's New

Translation System (i18n)

• All sensor names are now translatable via Home Assistant's translation system
• English sensor names for non-German users (e.g. "Self Consumption" instead of "Eigenverbrauch")
• German translations preserved — existing users see no difference
• Full English translation for setup and options dialogs

Code Cleanup

• All comments and docstrings translated to English
• Icons moved to brands/ directory (HA standard)

⚠️ Breaking Changes

• Attribute keys changed from German to English (e.g. verbrauch_kwh → consumption_kwh, fazit → conclusion)
• Device names changed (e.g. "Batterie" → "Battery", "Strompreise" → "Electricity Prices")
• If you use attribute keys in automations/templates, update them accordingly