add the possibility to update translation from BaRatinAGE

[IvanHeriver]

Since the translations used within BaRatinAGE may change, could be useful to offer the possibility to the user to update the translation directly from BaRatinAGE itself.

A possible solution could be to add a button "Update translations" in the menu "Options".

This feature could be implemented using the fact that the address of the translation file on github doesn't change (https://raw.githubusercontent.com/BaRatin-tools/BaRatinAGE/main/lang/dico.txt) and can be used to automate downloading and replacing the dico.txt file within the /lang/ folder of BaRatinAGE.