Store language (#251)

* clean out unneeded locales
* add test to verify that language is picked up in admin.cfg
* add basic question for language and use variable in compose
* use scriptlet to generate locales before start of kopano-server
* add script to check folders of a given mailbox (for language checks)
* add tests for locale generation

relates to #248

core/start-service.sh

@@ -42,6 +42,30 @@ fi
 # start regular service
 case "$SERVICE_TO_START" in
 server)
+	# TODO this could check if the desired locale already exists before calling sed
+	KCCONF_ADMIN_DEFAULT_STORE_LOCALE=${KCCONF_ADMIN_DEFAULT_STORE_LOCALE:-"en_US.UTF-8"}
+	# get locales from env
+	# shellcheck disable=SC1004
+	sed --regexp-extended --expression='
+
+		1  {
+			i\
+# This file lists locales that you wish to have built. You can find a list\
+# of valid supported locales at /usr/share/i18n/SUPPORTED, and you can add\
+# user defined locales to /usr/local/share/i18n/SUPPORTED. If you change\
+# this file, you need to rerun locale-gen.\
+\
+
+
+			}
+
+		/^('"$KCCONF_ADMIN_DEFAULT_STORE_LOCALE"')(_[[:upper:]]+)?(\.UTF-8)?(@[^[:space:]]+)?[[:space:]]+UTF-8$/!   s/^/# /
+	' /usr/share/i18n/SUPPORTED >  /etc/locale.gen
+	# make sure that en_US and de_DE are always there
+	sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen
+	sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen
+	dpkg-reconfigure --frontend=noninteractive locales
+
 	# determine db connection mode (unix vs. network socket)
 	if [ -n "$KCCONF_SERVER_MYSQL_SOCKET" ]; then
 		DB_CONN="file://$KCCONF_SERVER_MYSQL_SOCKET"