i18n add_translations: add parameter for translations dir and i18n domain
i18n add_translations: add parameter for translations dir and i18n domain

Some project would put i18n files in 'locale/', 'i18n/' and so on...
Also, gettext uses domain to find .mo files ("domain.mo")

abilian/abilian-core,abilian/abilian-core,abilian/abilian-core,abilian/abilian-core,abilian/abilian-core