I partly agree with you, Joseph, but my experience translating Moodle (and other free software like KDE) to Catalan has shown me that in some cases is not easy to find a string on the user interface, or the desired string is only shown in some cases that are not easy (or time-consuming) to reproduce by the translator.
So proper context is a first step and sometimes a necessary and valuable information to be able to produce quality translations.
My 5 cents
Orestes.