add missing i18n keys to az.yml (#13152)
remove "permission_manage_documents" from az.yml (#13152, #12401)
remove unused "label_modification" i18n keys from az.yml (#13152, #12645)
These keys were removed from app/views/repositories/revision.rhtml by r535 and app/views/repositories/revisions.rhtml by r381.
remove unused "label_download" i18n keys from az.yml (#13152, #12645)
These keys were removed from app/views/documents/show.rhtml by r1180.
remove unused "gui_validation_error" i18n keys from az.yml (#13152, #12645)
These keys were removed from app/helpers/application_helper.rb by r2493.
remove unused i18n string from az.yml (#13152, #8373)
add Azerbaijanian translation (#13152)
Contributed by Samir Suleymanov.
fix double "one" in Polish translation by Filou Centrinov (#7202)
Polish translation updated and changed (#7202)
Code cleanup.
