Reorganize i18n files under the template1/template1.pot, template1/lang.po style

Reorganize i18n files under the template1/template1.pot, template1/lang.po style

According to https://help.launchpad.net/Translations/ImportPolicy, this matches
the standard GNU gettext layout and will enable Launchpad to import our files
from the repository to enable translations via Launchpad.

Which means, of course, that we will once again have to add the en-US POT
files to the repository. Fun fun.

Also note that the Makefile has been simplified somewhat; unused targets
have been removed, and the simplified directory structure enabled me to
reduce some variables.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@14948 dcc99617-32d9-48b4-a31d-7c20da2025e4