Guild Plugin

• Completely refactored language structure: separated GUI, command, and module messages
• Added more languages: German, French, Spanish, Japanese, Korean, Traditional Chinese, Malay, Italian, Dutch, Swedish, Turkish, Vietnamese, Thai, Arabic, Czech, Portuguese, Ukrainian, Romanian, Hungarian, Danish, Finnish, Norwegian (plus custom language file support)
• Added 3 new APIs to the SDK (see Wiki for details)
• Expanded module marketplace with custom download source support
• Fixed command logic and added missing command key values.

⚠️ Update notice: Delete all config files except guild.db, guild.db-shm, and guild.db-wal. This requires reconfiguring config.yml and database.yml.