After creating a new object English language in my module I synchronize the translation of this language and another language x to add this new object in the list of translated terms and then translate it into the language x... up to now no problem...

When synchronizing language x second and nth time for the addition of other new terms there is a duplication n times previously translated words !

Questions:

1- Is my method adding new terms to the list of translated terms for translation is correct?

2- How to stop this duplication?