add 2FA

[Ludy87]

Changelog

➕ Added

• Added two-factor authentication (MFA) support for login.
• New translations and strings for error messages and login flow.
• Added the ability to handle unexpected errors during login.
• Implemented additional error handling for connection timeouts and unknown errors.
• Added two-factor authentication documentation for both German and English languages.

🔄 Changed

• Updated translation files for English (en.json) and German (de.json).
• Updated various components and dependencies for improved stability and compatibility.
• Updated the URL for ista EcoTrend Version 2 to "https://ecotrend.ista.de/".
• Updated version number to v2.1.3 in manifest.json.

🔧 Fixed

• Fixed an issue with incorrect translations for error messages.
• Fixed handling of connection timeouts during data update.
• Fixed logout when the entity is removed from Home Assistant.

➖ Removed

• Removed unnecessary imports and unused code.

[github-actions]

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