feat: add italian translation

[Angelk90]

Hi @hossein-zare , could you check if line 47 of the src/translations/index.js control was written correctly, I had to improvise a little.

[hossein-zare]

Hi,

Thank you for the PR.

could you check if line 47 of the src/translations/index.js control was written correctly, I had to improvise a little.

No, {count} is replaced using the String.prototype.replace() method so you can't do {count} === 1.

react-native-dropdown-picker/src/components/Picker.js

Line 592 in 71c166b

return _multipleText.replace('{count}', item.length);

Please follow the English translation.

react-native-dropdown-picker/src/translations/index.js

Line 5 in e37d869

SELECTED_ITEMS_COUNT_TEXT: '{count} item(s) have been selected',

Your idea of conditionating translations is really good, If you don't mind, Please create a new issue for that (Feature Request).
That won't be possible but alternative solutions will be introduced.

[Angelk90]

@hossein-zare : The problem if I had to follow the English translation would not be very correct in Italian, it is difficult to explain.
I can do it anyway, we will see to fix it in the future.

[hossein-zare]

Okay, We had the same problem with the Russian translation.

[Angelk90]

@hossein-zare : Ok, I don't really like it as a linguistic form, but I tried to follow the Spanish example.

[hossein-zare]

@Angelk90
I'm going to mark your PR as pending and improve the translation system.
Later i'll ask you to update your translation.

Thank you.

[hossein-zare]

@Angelk90

Is it ok now?

[Angelk90]

@hossein-zare : Updated.