Add back i18n hints. Remove mod-track-panel (no official support). Regen audacity.pot
XO() can be used anywhere a string must be extracted for translation but not automatically translated at runtime.
If you can believe it, this whole big mess is just to get localized effect labels back into the menus. I sure wish I'd had a little bit more time to finish up all of the effects. It sure would be a lot cleaner (code wise).
