Support for GPT-5 and app localization

[machinewrapped]

Added support for the GPT-5 models gpt-5, gpt-5-mini and gpt-5-nano. These require OpenAI's newer Responses API rather than the old Chat API, so the client has been updated. Updated the documentation with recommendations on the model to use... spoiler alert: not gpt-5-nano!

Something I've wanted to do for a long time is add localization to GPT-Subtrans so that you can use it in your own language - it also seemed like a good opportunity to try out AI agent workflows, so this feature was a collaboration between:

• Claude Code
• Cursor Agent
• Github Copilot Agent
• Gemini Code Assist (mainly as reviewer)
• Gemini 2.5 Pro (translator)
• ChatGPT (translator)
• @machinewrapped (mainly the $ for API credits and commiserating with Gemini when it repeatedly failed to write working code)

Localization is provided for Spanish and Czech to start with - I encourage users to contribute localizations to their own locale. The process is quite straightforward if you can install from source, and documented in docs/localization_contributing.md. I have no current plans to add further locales myself, but could probably be persuaded if there was a volunteer to test it.

Note that the PR was over 10,000 lines of code, most written by AI, so there are likely to be bugs in the initial release, but the standard load/translate/edit operations are all tested and working.

What's Changed

• Fix: summary tag autoclosing broken. by @zorbathut in Fix: summary tag autoclosing broken. #247
• break after truncating text by @machinewrapped in break after truncating text #248
• Configurable timeout for custom servers by @machinewrapped in Configurable timeout for custom servers #249
• Add support for GPT-5 by @machinewrapped in Add support for GPT-5 #256
• Add localization support by @machinewrapped in Add localization support to GPT-Subtrans #257

New Contributors

• @zorbathut made their first contribution in Fix: summary tag autoclosing broken. #247

Full Changelog: v1.1.2...v1.2.0

---

This discussion was created from the release Support for GPT-5 and app localization.

[machinewrapped]

If you want to use GPT-Subtrans in your own language then it is pretty easy to localize it - the translation process is mostly
automated.

Assuming you have the project installed as source, the update_translations.py script does most of the work for you.

I suppose it's possible to add a locale to a packaged build, but you won't be able to make use of the helper script. If you're familiar with PO editing tools and workflows maybe that's better for you.

If you have successfully localized the app to a new language, please create a pull request to integrate it into the repository, or create an issue with the PO file attached so that I can integrate it.

I'll try to keep all localizations updated as new strings are added to the application, with help from my LLM buddies.