plpgsql is not translate-aware

Hi,

In reviewing Volkan Yazici's (sorry for the dots) patch to improve
plpgsql's error messages, I noticed that we have no PO files for plpgsql
at all!

It doesn't seem hard to add; I just had to create a nls.mk file and
things seem ready to go.  Obviously, we'll need to add plpgsql to the
pgtranslation files in pgfoundry.

There are 141 new strings to translate, and from spanish I get 71
fuzzies, so it seems an easy project.

Should I go ahead and commit the initial files?

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.