It appears to be a bug with the Spray Tracer plugin. After looking at the source, I see that a lot of translations are formatted improperly.
For example:
Code:
Format(warn, 127, "%t", "Warn");
Should be:
Code:
Format(warn, 127, "%T", "Warn", client);
This is causing the menu to fall back to the server language (English in this case) on some occasions. I suggest reporting this bug to that specific plugin.