[I18N] Update translation terms from Transifex

addons/account/i18n/da.po

addons/account/i18n/es.po

addons/auth_signup/i18n/es.po

addons/fleet/i18n/ja.po

addons/gamification/i18n/es.po

addons/mass_mailing/i18n/es.po

addons/mrp_repair/i18n/el.po

addons/mrp_repair/i18n/it.po

addons/payment_transfer/i18n/es.po

addons/payment_transfer/i18n/sl.po

addons/point_of_sale/i18n/it.po

addons/procurement/i18n/it.po

addons/project/i18n/es.po

addons/stock/i18n/es.po

addons/stock/i18n/it.po

addons/warning/i18n/da.po

addons/web_gantt/i18n/es.po

addons/web_gantt/i18n/sl.po

addons/website_event/i18n/it.po

addons/website_gengo/i18n/it.po