Add English fallbacks for 12 missing keys in 41 language files.
Report all missing keys and XML errors before failing validation.
Run four regression tests in CI. All tests and 43 XML files pass.
* Linux/MacOSX: during build, fallback to /tmp if wxWidgets sources not found in parent directory
* Linux: Add Github workflow to build .deb files and test generated binaries
* Linux: fix wrong wxWidgets extract path in yaml
* fix: fix wrong wxWidgets extract path in yaml
* Linux: harmonize content of test volumes and update Github workflow for this
* Fix corrupted test container
* Linux: optimize Github workflow by caching wxBuildConsole and wxBuildGUI folders
We also modify build script to detect the presence of wxBuildConsole and wxBuildGUI folders and reuse them
* Remove files mistakenly added
* Linux: Fix wrong test for Github workflow
* Linux: use static build of wxWidgets for GUI in Github workflow
* Linux: upload also .deb SHA256SUM file if it is generated in Github workflow
* Linux: fix detection logic of parent folder in build scripts
* Github workflow: add build_cmake_deb.sh as trigger to build-linux.yml
* Github workflow: add wxWidgets source code to the cache of workflow