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To build the tar.gz, creating a config file with the list of distributed languages, and creating a workdir in which we stage files before creating the .tar.gz.

bin/compile-mo-files-extensions.sh: bugfix in check to mkdir the po directory, and only rsync if the current user is l10n (less disruptive to other people who may want to use this script).

Add the mo/ directory, to centralise all .mo files after compilation and facilitate the rsync (mo files themselves must not be committed to the git repo).

INFRA-104: compile-mo-files-extensions.sh: new script to compile the po/mo files for all extensions, and sync to download.civicrm.org.

INFRA-104: create-pot-files-extensions.sh: add env variable CIVI_KEEP_IT_QUIET to reduce the number of messages which are not relevant to the automatic process (we still want some feedback, to have a better jenkins trail of what is happening..)

INFRA-104: civiextensions-update-transifex.php: many cleanups, finish add/push to Transifex of new resources, add/commit to the git repo.

INFRA-104: string extraction for published extension translations

Allow to set the potdir using the POTDIR environment variable.
This makes it easier to pass a specific script argument, but not need
to pass the other arguments which can be auto-detected by this script
using the info.xml of the extension.