generate the locales before change to it.

For my german box changing the locale failed:
´´´´/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
/bin/sh: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
setup/functions.sh: line 6: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)´´´´

see #206 and 4e6d572d
closes #220
commit modified by joshdata

conf/management-initscript

@@ -28,7 +28,8 @@ EXEC_AS_USER=root
 # Ensure Python reads/writes files in UTF-8. If the machine
 # triggers some other locale in Python, like ASCII encoding,
 # Python may not be able to read/write files. Here and in
-# setup/functions.sh.
+# setup/start.sh (where the locale is also installed if not
+# already present).
 export LANGUAGE=en_US.UTF-8
 export LC_ALL=en_US.UTF-8
 export LANG=en_US.UTF-8

setup/functions.sh

-# Ensure Python reads/writes files in UTF-8. If the machine
-# triggers some other locale in Python, like ASCII encoding,
-# Python may not be able to read/write files. Here and in
-# the management daemon startup script.
-export LANGUAGE=en_US.UTF-8
-export LC_ALL=en_US.UTF-8
-export LANG=en_US.UTF-8
-export LC_TYPE=en_US.UTF-8
-
 function hide_output {
 	# This function hides the output of a command unless the command fails
 	# and returns a non-zero exit code.

setup/start.sh

@@ -8,6 +8,21 @@ source setup/functions.sh # load our functions
 # machine with enough memory? If not, this shows an error and exits.
 . setup/preflight.sh
 
+# Ensure Python reads/writes files in UTF-8. If the machine
+# triggers some other locale in Python, like ASCII encoding,
+# Python may not be able to read/write files. Here and in
+# the management daemon startup script.
+
+if [ -z `locale -a | grep en_US.utf8` ]; then
+    # Generate locale if not exists
+    hide_output locale-gen en_US.UTF-8
+fi
+
+export LANGUAGE=en_US.UTF-8
+export LC_ALL=en_US.UTF-8
+export LANG=en_US.UTF-8
+export LC_TYPE=en_US.UTF-8
+
 # Recall the last settings used if we're running this a second time.
 if [ -f /etc/mailinabox.conf ]; then
 	# Run any system migrations before proceeding. Since this is a second run,