Relates #311: MacOS: create Resources/<lang>.lproj directory

This should persuade the OS to switch the Finder Menu
to the current language.
At least for me it does not work.

Keep it for reference. It does not hurt either.

lang/CMakeLists.txt

@@ -18,6 +18,10 @@ foreach(lang ${XCA_LANGUAGES})
   endif()
   string(APPEND LANG_COMPS "  </Component>\n")
   list(APPEND LANG_ALLCOMPS ${LANG_COMPS})
+  execute_process(COMMAND ${CMAKE_COMMAND} -E touch ${D}/${lang}.keep)
+  target_sources(${CMAKE_PROJECT_NAME} PRIVATE ${D}/${lang}.keep)
+  set_source_files_properties(${D}/${lang}.keep PROPERTIES
+    MACOSX_PACKAGE_LOCATION "Resources/${lang}.lproj")
 endforeach()
 
 string(APPEND WIX_LANG_CONTENT
@@ -29,7 +33,6 @@ WixFile(${D}/language.wxs ${WIX_LANG_CONTENT})
 if (${QT_VERSION} VERSION_LESS 6.0.0 )
   qt5_add_translation(QM_FILES ${TS_FILES} OPTIONS -silent)
   message(STATUS "Updating translations from source with 'lupdate' only supprted with QT6")
-  target_sources(${CMAKE_PROJECT_NAME} PRIVATE ${QM_FILES})
 else()
   get_target_property(LIBSRC xcalib SOURCES)
   get_target_property(XCASRC xca SOURCES)
@@ -40,7 +43,7 @@ else()
   )
   add_custom_target(trans DEPENDS xca_lupdate "${D}/xca.pot")
 endif()
-list(APPEND APP_RESOURCES ${QM_FILES})
+list(APPEND APP_RESOURCES ${QM_FILES} ${LANG_DIRS})
 target_sources(${CMAKE_PROJECT_NAME} PRIVATE ${QM_FILES})
 
 if (UNIX AND NOT APPLE)