Hi @eshagh79, first of all thank you for your PR.

I have a doubt, why there are so many differences between your translation and the original Persian contributor’s submission?

Hi
The previous translator had tried to translate the sentences into Persian with translation machines such as Google Translator.
In most of the sentences, the grammar was not observed and he did not try to use the equivalent words in Persian.
For example, in Persian, "task" == is "وظیفه", but he translated it as "تسک", which gave the exact sound of task, but we do not have such a word in Persian, but it is used among people.
T = 'ت'
S = 'س'
K = 'ک'
And many other words that are the same, that is, although they are used among the people, but they are not Persian words
For example, the word "آپدیت" is used among people, but the correct word is "به‌روز رسانی" = (update).
Although I tried to improve this translation, it is still incomplete and has problems.

WIP or completed? Can I merge it now?

It is much better now.
You can merge.