Bugfix UI Mirroring

[Alex2782]

with this small adjustment UI Mirroring Demo works like before with the version Godot.4.0-rc6

@bruvzg: do you see any problems when en is no longer hardcoded?
(Note: in the header file locale is initialized with 'en'. )

https://github.com/godotengine/godot-demo-projects/tree/master/gui/ui_mirroring

original gscript

Screen-2023-10-05-164133.mp4

[bruvzg]

This is wrong, and will cause all untranslated (and English) apps to mirror on the systems with RTL system locale. Hard-coded "en" is correct, since it's a language of the translation keys by definition. So this is not a bug and should not be changed.

Instead, it should only mirror if app have translation for the RTL language (demo likely have it missing, but it should be fixed in the demo project).

[bruvzg]

So the correct fix for the demo is:

• Add dummy translation.csv to the project:

keys,en,ar
dummy,dummy,dummy

• Import it, and add both generated translation files in the Projects Settings→Localization→Translations.

[Alex2782]

ok I will try it later

[Alex2782]

Thanks for the tips!

godotengine/godot-demo-projects#974