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Data Processing and UI Separation in Plotly Dash

This content teaches software architecture principles for separating concerns in interactive applications, specifically internationalization (i18n) and the Model-View-Controller (MVC) pattern applied to data dashboards. The core theoretical mechanisms are: (1) externalizing display strings into locale-keyed resource files accessed via a translation function, decoupling presentation text from application logic; (2) functional composition (via reduce/partial application) to build data-transformation pipelines from single-purpose functions; and (3) structural typing (Python's Protocol classes) to define minimal interfaces that decouple UI components from concrete data implementations. These belong to the software engineering domain, specifically application architecture and design patterns, relating to the broader discipline of separation of concerns and dependency inversion.