Fix multipart strings

[gantoine]

Description
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Checklist
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• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR
• I've added unit tests that cover the changes

[gemini-code-assist]

Summary of Changes

Hello @gantoine, 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 refactors how multi-part strings are handled in the frontend, particularly for messages involving counts of ROMs being added, removed, or deleted. Instead of concatenating several translation keys and dynamic values, the UI now uses single, parameterized translation keys. This streamlines the code in Vue components and centralizes the string construction within the localization files, making the application's internationalization more robust and easier to manage across various languages.

Highlights

• Refactored UI Strings: Consolidated multi-part UI strings (e.g., 'Adding X ROMs to collection') into single, parameterized translation keys within Vue components for improved readability and maintainability.
• Updated Localization Files: Modified rom.json files across multiple languages to support the new parameterized string format, replacing fragmented keys (like part1, part2) with a single key that accepts dynamic parameters.
• Enhanced Internationalization: The changes streamline the application's internationalization by centralizing string construction within localization files, making it more robust and easier to manage across various languages.

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[gemini-code-assist]

Code Review

This pull request is a great improvement for internationalization. It refactors multipart strings in Vue components to use single translation keys with interpolation and pluralization, which simplifies the templates and makes localization easier. The corresponding locale files have been updated accordingly. Additionally, many new translation keys have been added and the locale files have been sorted alphabetically, which improves maintainability.