Synchro with transifex

htdocs/langs/ar_SA/bills.lang

htdocs/langs/bg_BG/bills.lang

htdocs/langs/ca_ES/bills.lang

htdocs/langs/ca_ES/main.lang

htdocs/langs/da_DK/bills.lang

htdocs/langs/de_DE/bills.lang

htdocs/langs/de_DE/sms.lang

htdocs/langs/el_GR/admin.lang

htdocs/langs/el_GR/bills.lang

htdocs/langs/el_GR/compta.lang

htdocs/langs/el_GR/contracts.lang

htdocs/langs/el_GR/errors.lang

htdocs/langs/el_GR/exports.lang

htdocs/langs/el_GR/mails.lang

htdocs/langs/el_GR/main.lang

htdocs/langs/el_GR/projects.lang

htdocs/langs/el_GR/propal.lang

htdocs/langs/el_GR/stocks.lang

htdocs/langs/es_ES/bills.lang

htdocs/langs/es_ES/cron.lang