Fix midi-note length when quantizing a swing rhythm

Note: 'swing' probably requires a 2nd iteration:
first quantize notes to the grid, then apply beat shift.
make fixed IO ports untranslatable

Outdated and fuzzy translations of MTC, MTC, LTC, etc caused
various issues (duplicate jack port names, exceptions, crashes).
Functionality should not be affected by translations (for now).
remove fuzzy and obsolete translations
add script to clean up translations