The code samples in the manual are not translatable, as far as I can see. That's often OK, because code is code, but sometimes some keywords are translated or the code blocks contain some English explanation.
For example, the date search syntax explanation in
The Search Interface:
Code:
pubdate:>2000-1 Will find all books published after Jan, 2000
date:<=2000-1-3 Will find all books added to calibre before 3 Jan, 2000
pubdate:=2009 Will find all books published in 2009
Code:
date:>10daysago
date:<=45daysago
(this second sample is not so important, because "daysago" is always available regardless of the language, but it would be nice to include the translated keywords in the samples).