added texts to be reviewed in order to add mail templates to transifex
Review the english and enrich the content of the notification email templates.
adopted numbered variables format for templates
implemented grunt script for pushing/fetching templates on transifex and added pgp expiry alert/notice templates
addressed issue https://github.com/globaleaks/GlobaLeaks/issues/873
added Catalan and Thai
bump to version 2.60.6