(10 RC4) Package language files only being loaded on root level

[patrickdemooij9]

Which exact Umbraco version are you using? For example: 9.0.1 - don't just write v9

10 RC4

Bug summary

Somewhere in the changes for v10 there has been a change where only the language files in the folder 'lang' at your package root will be loaded.
I get the change, but this messes up with the way that I am currently doing the labels in SeoToolkit. In SeoToolkit, each functionality is its own package, but there exists a package that combines all the functionalities in one. Each functionality has its own language file, but all the package content files all live under a App_Plugins/SeoToolkit folder.
So with my structure, it goes like: App_Plugins/SeoToolkit/[Functionality]/lang/en-us.xml. Which now doesn't get picked up anymore. This did used to work in v9.

I also tried using this snippet of code:
builder.Services.AddTransient(sp => { var webhostEnvironment = sp.GetRequiredService<IWebHostEnvironment>(); return new LocalizedTextServiceSupplementaryFileSource(new FileInfo(webhostEnvironment.ContentRootFileProvider.GetFileInfo("/App_Plugins/SeoToolkit/ScriptManager/lang/en-us.xml").PhysicalPath), true).AsEnumerableOfOne(); });

Which worked great until I added another one of them in the project. Then it just removes the other one and it is basically fighting for a spot.

Specifics

No response

Steps to reproduce

Place a en-us.xml language file in /App_Plugins/[PackageName]/Something/lang

Expected result / actual result

Would love to have a way to fix this. I get the reason for changing it to only the root level, but then please provide a way to work around it. And at least mark this as a breaking change for other package developers.

[nikolajlauridsen]

Fixed in #12543 👍