Setup trove for translation

The upstream-translation-job exists already but fails since trove
is not setup properly for translation.

Add the usual babel.cfg file, update setup.cfg for translation and
create initial trove.pot file.

Change-Id: I65ca2c974fc54e005ba8887dceb66ac08432c6d1

babel.cfg

@@ -0,0 +1,2 @@
+[python: **.py]
+

setup.cfg

@@ -40,3 +40,17 @@ setup-hooks =
 all_files = 1
 build-dir = doc/build
 source-dir = doc/source
+
+[compile_catalog]
+directory = trove/locale
+domain = trove
+
+[update_catalog]
+domain = trove
+output_dir = trove/locale
+input_file = trove/locale/trove.pot
+
+[extract_messages]
+keywords = _ gettext ngettext l_ lazy_gettext
+mapping_file = babel.cfg
+output_file = trove/locale/trove.pot