BIP39: Add Arabic Language Support

[qusaismael]

No description provided.

[ghost]

This PR has several issues. First, all the words in arabic.txt are reversed, but Arabic is a right-to-left (RTL) language, so they should appear correctly. Additionally, there are very few (if any) widely used Arabic Bitcoin wallets, making this change of questionable value.

Furthermore, it's unclear which variant of Arabic is being used here (e.g., Modern Standard Arabic, a specific dialect, etc.), which could lead to usability problems.

[jonatack]

Thank you @qusaismael for your proposal. Nevertheless, am closing here, as the BIP39 authors no longer support further wordlists except for the English one, in order to maximize interoperability (see #1395 (comment)). Also, per BIP39: "Since the vast majority of BIP39 wallets supports only the English wordlist, it is strongly discouraged to use non-English wordlists for generating the mnemonic sentences." Thanks again.