Comment 5 for bug 1740551

Different issues are mixed up here:

1* The strings in the Shade Skin are hard coded (font merged to the background graphic). There was no translation possible back when the skin was created. Looking from today, this is oneof the Shade skin´s drawbacks.

We decided to use i18n wherever possible. There is always the possibility to change language, or fall back to the source language en_US.

2* The short parameter named mentioned by @Be are not available for some eq parameters, must have slipped through.
https://github.com/mixxxdj/mixxx/blob/master/src/effects/native/equalizer_util.h
This are the strings you tagged as issues on Transifex.