settings: add an "force en translation" toggle on top

[jinliu]

This should be convenient for translators when proofreading translations.
When you find something in doubt, just turn on this toggle to check the
original English text, without needing to go to the translation website
and search.

To enable it, set the environment variable NOCTALIA_TRANSLATOR=1 before
launching Noctalia. E.g.:

NOCTALIA_TRANSLATOR=1 noctalia

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a debug-only UI control in the Settings filter row to force the application language to English for easier localization/UX debugging.

Changes:

• Introduces a #ifndef NDEBUG “en” label and toggle in the settings filter row.
• Tracks toggle state via a new debug-only m_forceEnTranslation member.
• Switches i18n::Service language to "en" when enabled and back to configured language when disabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/shell/settings/settings_window_scene.cpp	Adds debug-only label + toggle that switches the runtime language via i18n::Service.
src/shell/settings/settings_window.h	Adds debug-only member to track the “force English” toggle state.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ItsLemmy]

I like the idea, but I think it could be better. Right now this assumes translator run the debug build, which most probably don't as they are not developers.

Maybe via a ENV var would be better.

[jinliu]

Maybe via a ENV var would be better.

Good idea. Will do.