feat: add profile language preferences and refine toast, dropdown and history UI

migrations/mysql/0033_user_language.sql

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+ALTER TABLE users ADD COLUMN language VARCHAR(16) NOT NULL DEFAULT 'en';

migrations/postgres/0033_user_language.sql

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+ALTER TABLE users ADD COLUMN language TEXT NOT NULL DEFAULT 'en';

migrations/sqlite/0033_user_language.sql

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+ALTER TABLE users ADD COLUMN language TEXT NOT NULL DEFAULT 'en';