Selecting target languages in a solution where some projects have more translation files available

[Ririshi]

Is your feature request related to a problem? Please describe.
I have a solution with multiple GUI projects and an in-house base GUI library that has many translations shipped with it in various resx files. The GUI projects only require two languages. When I compile these projects, I get many warnings saying "Missing translation" because there are no resx files for most languages in the GUI projects. I do not want to disable error reporting because I might miss real missing translations that way, but the reporting is currently unusable due to the sheer number of false positives.

Describe the solution you'd like
A solution-wide (optionally with project-specific override) configuration that allows me to select which languages I want to use, even if more translations are available in one or more projects.

Describe alternatives you've considered
Deleting the unused translations files from the base GUI library. However, this requires me to create and maintain a separate version, which makes updating to newer versions more difficult.

Additional context
N/A

[tom-englert]

You could provide a PR for this.