TLDR

This Pull Request adds complete Catalan (ca) language support for Qwen Code CLI, including:

• Full translation of the entire interface to Catalan (specifically, all text available in the locale files)
• Support for changing the language via /settings or /language commands

Dive Deeper

What's included:

1. packages/cli/src/i18n/locales/ca.js - Main translation file containing all translated phrases
2. packages/cli/src/i18n/index.ts - Added Cataln language designation for system detection

Translation approach:

• Manual translation: The translation was done entirely by hand without using any automated tools. However, since I don't use all of Qwen Code's features, there may be some inaccuracies in the more advanced UI sections. Nevertheless, I maintained the context that this is a tool for working with artificial intelligence, so the translation should be largely correct or at least comprehensible to end users.
• Loading phrases: A significant portion of my translation time was spent on loading phrases. I try to adapt as much as possible to politically correct jokes in Catalan.
• Accessibility considerations: I understand that many programmers from Eastern Europe have no issues understanding English, but this doesn't diminish the fact that having a Catalan interface makes the experience more pleasant. Moreover, considering that AI agents significantly lower the entry barrier for beginner programmers, it's crucial to provide them with a tool that doesn't raise questions about "how" to use it.

Reviewer Test Plan

After launching Qwen Code CLI via the qwen command, if the user has Catalan set as their system language and the "Auto (detect from system)" option is selected in settings, Qwen Code should automatically display in Catalan.
Catalan language can also be enabled manually through two methods:

1. Using the /language command

/language ui ca-ES
/language ui ca
/language ui catalan

Testing Matrix

I was only able to test Qwen Code on my personal computer running Linux. However, since the changes only affect the language (I did not alter the functionality of the program in any way), I am confident that there should be no compatibility issues on other platforms.

Linked issues / bugs

This PR addresses community interest in Catalan language support for international users. While there's no specific open issue, this follows the pattern established by existing Chinese (zh) translation.

Screenshots