Linguist examples lack translation-related instructions in CMakeLists.txt

The CMake project files in qttools/examples/linguist lack any translation-related instructions in CMakeLists.txt. See for example arrowpad:

TRANSLATIONS = arrowpad_fr.ts \
               arrowpad_nl.ts

should be something like

qt6_add_translations(arrowpad
    TS_FILES arrowpad_fr.ts
                   arrowpad_nl.ts)

with some adjustments