[Fixes #13649] Multilang: remove modeltranslation

[etj]

See #13649

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[gemini-code-assist]

Summary of Changes

Hello @etj, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a significant refactoring effort to remove the django-modeltranslation library from the GeoNode project. The change streamlines the application by eliminating a third-party dependency and its associated multilingual features. This involves a comprehensive cleanup across the codebase, affecting model definitions, administrative interfaces, and form handling, and includes necessary database schema adjustments to remove deprecated translation fields.

Highlights

• Dependency Removal: The django-modeltranslation library has been completely removed from the project, including its package from requirements.txt and its entry from INSTALLED_APPS.
• Database Schema Updates: New database migrations have been added across multiple applications (base, documents, geoapps, groups, layers, maps, services) to remove all _en suffixed translation fields that were previously managed by django-modeltranslation.
• Codebase Simplification: All translation.py files, which configured django-modeltranslation for various models, have been removed. Admin classes and forms have been updated to no longer inherit from TabbedTranslationAdmin, TranslationAdmin, or TranslationModelForm, reverting to standard Django admin.ModelAdmin and forms.ModelForm.

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[gemini-code-assist]

Code Review

This pull request effectively removes the django-modeltranslation dependency from the project. The changes are comprehensive, including removal from requirements, Django settings, updating admin and form classes, and adding migrations to clean up the database schema. The removal appears to be executed correctly across all affected modules. The changes are systematic and well-executed.