Remove depreciated file babel.cfg

The file babel.cfg is not used anymore.

This patch removes the depreciated file and the translation
sections in setup.cfg (extract_messages, compile_catalog and
update_catalog) as these not needed anymore,
Babel can generate translation files without them.

Change-Id: I86a0ce342ae695c9529d3cf5bd4ac3779f9a9205

babel.cfg

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

lower-constraints.txt

@@ -1,7 +1,6 @@
 alabaster==0.7.10
 appdirs==1.3.0
 asn1crypto==0.23.0
-Babel==2.3.4
 cffi==1.14.0
 cliff==2.8.0
 cmd2==0.8.0

requirements.txt

@@ -2,7 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-Babel!=2.4.0,>=2.3.4 # BSD
 cliff!=2.9.0,>=2.8.0 # Apache-2.0
 PyYAML>=3.13 # MIT
 python-dateutil>=2.5.3 # BSD

setup.cfg

@@ -36,17 +36,3 @@ openstack.translator.v1 =
 
 console_scripts =
     heat-translator = translator.shell:main
-
-[compile_catalog]
-directory = translator/locale
-domain = translator
-
-[update_catalog]
-domain = translator
-output_dir = translator/locale
-input_file = translator/locale/translator.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = translator/locale/translator.pot