Use Babel to generate translation strings

babel.cfg

@@ -0,0 +1,4 @@
+# Extraction from Python source files
+[python: **.py]
+# Extraction from Jinja2 template files
+[jinja2: **.html]

scripts/make-messages.sh

@@ -1,17 +1,10 @@
 #!/bin/bash
 
-xgettext -d mailpile -L Python \
-	$(find . -name "*.py") \
-	$(find . -name "*.html") \
-	--keyword=gettext_noop \
-	--keyword=gettext_lazy \
-	--keyword=ngettext_lazy:1,2 \
-	--keyword=pgettext:1c,2 \
-	--keyword=npgettext:1c,2,3 \
-	--from-code UTF-8 \
-	-o locale/mailpile.pot
-
-# 	--omit-header
+pybabel extract --project=mailpile \
+    -F babel.cfg \
+    -o locale/mailpile.pot \
+    .
+#	--omit-header
 
 for L in $(find locale/* -type d	\
 		| grep -v "LC_MESSAGES"	\