Indeed you are right, translations are incomplete. We will definitely aim to have all "navigation" items properly translated, but I'm not sure it's feasible to translate ALL settings, as there are several hundred each with [help] options.
For now, I am kinda waiting to get started with X3 Panel 2.0 which will include options for complete translations, but I won't be adding it to current panel 1.0. Thanks for your offer to help! Stay tuned.