Inconsistent translations

[Ronaly]

I am using cups 1.3.3 and ppdc. I also have my own message catalog (PO).
Most of the strings are translated on different locales based on my message catalogs. But there are few strings that have their own translations and never get from my message catalog.
For example, "Tray 1", "Tray 2",  "Statement".

(ex. in French)
Expected Translations:			From generated PPD:
Tray 1 - Tiroir 1				Tray 1 - Bac 1
Tray 2 - Tiroir 2				Tray 2 - Bac 2
Statement - Statement US		Statement - Relevé

Is this a bug in cups?