Missing strings to translate ?
Fragment of a discussion from Translating talk:MantisBT/LiquidThreads
They are probably under optional messages task.
Nike
You are correct, they are indeed in the optional messages [1]
The problem lies in the MantisBT code which does not correctly fall back to default language (English) when a string is not defined in the translated strings file. I'll fix that.
Thanks for pointing me in the right direction.
Damien