Fix typo
Update translation template. Found 1856 source text(s) (39 new and 1817 already existing). Kept 33 obsolete entries
We now use consistent ReplayGain spelling across all translatable strings.
Fix memory corruption for waveforms larger than 4096^2.

Potentially fixes Bug #1383404.
Fix waveform concurrency issues. Potentially fixes Bug #1383404.

* Use const shared pointers for waveforms.
* Move all std::vector sizing operations to the Waveform constructor. No
  vector state is allowed to change after the constructor finishes.
* Clarify comments.
* Remove waveform mutex usage in WOverview variants.
* Use the track's waveform pointer to atomically swap the waveform
  rather than mutating the waveform in place.
* Remove unused code.