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

**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