fix(CMakeLists): supports new cmake versions for qm translations

assets/languages/CMakeLists.txt

@@ -27,6 +27,13 @@ file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${I18N_FILENAME}" "${I18N_CONTENT}")
 # Create `qm` files from `ts` files.
 qt5_create_translation(QM_FILES ${TS_FILES} ${SOURCES} ${HEADERS} ${QML_SOURCES} OPTIONS -no-obsolete)
 
+# Workaround: Create empty files for some cmake versions. Otherwise, the qm rules can't be used.
+foreach (qm ${QM_FILES})
+  if (NOT EXISTS "${qm}")
+    file(GENERATE OUTPUT "${qm}" CONTENT "")
+  endif ()
+endforeach ()
+
 # Update translations.
 add_custom_target(update_translations
   COMMAND ${CMAKE_COMMAND} "-DLANGUAGES=\"${LANGUAGES}\"" -P "${CMAKE_CURRENT_SOURCE_DIR}/clean_translations.cmake"